A Study on the Role of Web 4.0 and 5.0 in the Sustainable Tourism Ecosystem of Ho Chi Minh City, Vietnam

: This research discusses the role of Web 4.0 and 5.0 devices on the commercial sustainability for tourism in Ho Chi Minh City (HCMC), Vietnam. The study adopts a tourist perspective regarding the future implementation of Web 4.0 and 5.0 devices, focusing on the service quality of various tourism-associated services and assessing, in return, the extent to which the overall satisfaction and long-term patronage of tourists is affected. Usually, researchers conduct this test in various popular establishments where devices are intended for experimental use and tourists are supposed to have previous exposure to them, so that their perceptual thinking regarding the service quality of these devices can be studied. The tourists act as respondents for various establishments. We also asked subjective questions in a short interview to 10 professionals working in these establishments, which helped us in the quantitative survey process. As a mixed method study, it has covered both quantitative and qualitative aspects of the items and provided a holistic result. The results indicated that Web 4.0 and 5.0, along with the service quality offered by personnel working in the establishments, showed significant variance in holistic service evaluation for tourist satisfaction and loyalty. Very few service quality factors had a distinct variance in the output. After using a regression analysis for Web 4.0 and 5.0 devices and service quality, we found that Web 4.0 and 5.0 showed insignificant negative results. This study contributes to the incremental research on Web 1.0 to 5.0, specifically detailing how it affects tourists’ satisfaction and patronage. Moreover, from a management point of view, this study can help solve the financial riddle of various establishments in HCMCs tourism ecosystem for optimum fund management and better productivity.


Introduction
Since the advent of new automated technologies and connectivity innovations, it has become paramount to know the impact of Web 5.0 on sustainable tourism. As suggested by Web 4.0, the interaction between human and machine tourism is likely to be affected. Ever since the symbiotic web evolved into the Symbionet decentralized network for Web 5.0, the study of the effect on the tourism ecosystem and sustainable development became a priority. In Web 5.0, tourists try connect via smart communication devices (SC) like smartphones, phablets, and humanoid robots with augmented and virtual reality (AR and VR) in order to enhance their experiences in the threedimensional (3D) virtual world of Symbionet [1]. This technology uses each part of our memory, along with the power of calculation, for each interconnected SC to provide the virtual world of artificial intelligence (AI). In Web 4.0, the Internet is emotionally unavailable and hardly feels the pulse of user perspectives. However, with Web 5.0, AR-and VR-enabled devices and headgear can enhance user experiences. Experiential marketing is now predominant in the tourism ecosystem to influence the behavioral intention of tourists [2]. Sustainable tourism is undergoing a drastic makeover, with more end-user experience-enhancing technologies in 3D-imprinted virtual reality [3]. Automation and Web 5.0 are important for changing the sustainability of each facet of tourism. Technology advances like 4G and 5G connectivity, big data, Internet of Things (IoT), AR, and VR act as prerequisites for change. Internet of People (IoP) is now incorporating the neural network with AR and VR to enhance real-time experience and give users a 3D feeling [4]. The primary objective of this research was to determine the stakeholders' service quality on tourists' satisfaction and loyalty in the tourism ecosystem, which can be attributed to the incremental changes of Web 5.0.
Web 5.0 affects tourism products, services, hotel industries, profiling of tourists, business models, and various bodies associated with the industry. We conducted interviews using a semistructured questionnaire on 812 participants. As a preliminary support to our quantitative survey, we asked about respondents' devices and their awareness of the Vietnamese hotel staff, travel agents, managers of private establishments and tourism administrators who play a supporting role in providing a better qualitative service to the tourists. They were also asked questions about operational know-how, satisfaction, and loyalty aspects regarding these devices, and what they think the impact is of these devices and their deployment.
The results showed that the majority of stakeholders are aware of Web 5.0 and its impacts as a constituent of overall service quality that holistically affects the satisfaction of tourists and the futuristic outlook of service establishments. The stakeholders also believe that Web 5.0 will bring new business models to a technology-driven era, with producers futuristic in their viewpoint. Younger tourists are more dependent on AR and VR with 4G and 5G when choosing between different tourist packages. Sustainable tourism exists where there is long-term tourist patronage and loyalty is reflected in all the endorsements of the various services offered.
In this study, researchers try to judge the holistic effect of Web 5.0 integration into various forms of tourism and related services in Ho Chi Minh City (HCMC), Vietnam, for appraising the satisfaction and loyalty of tourists. This integration can result in the long-term potential of sustainable smart tourism for the city, which greatly contributes to the gross domestic product (GDP) of the country.
Service quality is a necessary antecedent of tourist satisfaction and long-term patronage that results in loyalty in tourism marketing literature. It is the most challenging concept to actualize, as it considers the value proposition of the tangibility-intangibility complements of service [5]. With the rapid introduction of new communication technologies, the service sector is evolving quickly, with digitalization acting as a catalyst and artificial intelligence (AI) supporting the framework of new tourism innovations. To reach a more substantial mass and establish the operational superiority of tourist engagement, web technologies are becoming a pivotal force [6][7][8].

Evolution of Web in Tourism
In 1990, the internet was the main tool for creating online static brochures. It is known as Web 1.0.
In 2005, Web 2.0 -Here social networking websites, blogs, and podcasts became popular. Tourists use these mediums to share their experience with others about service providers. Audio, video, and text messages became the tools through which tourists communicated more [9]. So, the human interaction became very dominant force.
In 2007, Web 3.0-Semantic Web searches focused on context analysis and word meanings. It collaborated with various other sectors to accumulate information in e-commerce and e-health, as well as for use in the tourism sector. Here, information was be semantically attached to a corresponding level of relevance for a better output. Metadata (i.e., data of existing information) were cultivated for more remarkable results. Moreover, Web 3.0-Network Digital technology along with human cooperation focused on the transition from information orientation to knowledge orientation. It connected human cooperation with machines' digital ability and came out as digitalized organic source knowledge. It made interaction on the internet more fruitful and searching became a chutzpadik, self-collected, confident shareable, and informative experience [10]. It connected to what one can do with available information and gave a structural meaning to data. It was not an upgrade type of software. Instead, it was an evolution of web interference in tourism. It extended to Web 4.0 and 5.0, which represented web integration and decentralized smart communication [11].
In 2010, Web 4.0 AI agents acted as middlemen of human and machine interaction, dealing with the basic notion of computers and working without programs or apps. Web 4.0 had herculean potential in the tourism and hospitality industry. Web 4.0 also mostly worked on AI.
In 2017, Web 5.0 became a decentralized idea based on the Symbionet web. Here, a personal server (PS) was not always possible and people could be interconnected by a smart connector for communication like virtual reality devices and augmented reality tools (smart glasses). The Symbionet could be a part of emotional and cognitive elements in tourists. The Web can no longer be neutral. Companies like Emotive systems have built smart headphones by which one can connect with real-time facial expression and change output simultaneously [11]. Web 5.0 virtual reality brings emotional and cognitive impedance.
Therefore, in this incremental development of tourism services, these -based Web 4.0 and virtual reality backed Web 5.0 aim to enhance and augment the service for tourists. They are used to generate positive experience in tourists' minds (satisfaction) and long-term patronage (loyalty). Tourism always depends on tourists and their views. This reflective index of satisfaction and loyalty are the true reflection of service quality. All available research has mostly targeted Web 4.0 or AI-based tools for their service quality for tourists' perceptual evaluation. Still, we tried to integrate Web 4.0 and 5.0 to enhance service quality based on positive experiences and long-term patronage. Therefore, we herein attempted to fulfill the gap of Web 5.0 in service quality studies.
Technology always supports human intelligence and does not replace labor. However, with rapid technological advancement, it is practical to think that artificial intelligence may replace human intelligence. Similarly, Web 5.0 applications like AR and VR technologies are mostly futuristic. They are touted to help tourism service along with AI and other Web 4.0 applications to be the next revolution in this industry. Various blogs and articles support the tourism services in the future [12][13][14][15][16]. AR and VR also impact destination tourism by enhancing the reputation of the place and create an image of multisensory, picturesque, and conscious perceptual representations of a city or country for all inbound tourists [17][18][19][20][21].
Web 4.0 and 5.0 can only enhance technological support to replace certain activities, not jobs [22,23]. Here, we provide a detailed review along with insights into Web 4.0 and 5.0 applications in tourism services that can not only impact employee productivity but total productivity [23]. These devices undoubtedly affect employees' perceptual thinking, attitude, and behavior, as they believe that these devices could replace them in the near future [22]. Tourist engagement along with consumption of service consists of service personals and tangible elements. As there is a gap in tourists' responses to Web 4.0 and 5.0 devices, we tried to study tourist satisfaction and loyalty for these devices in the implemented destinations. The tourism ecosystem includes transportation, hospitality, wellness, and other related services. In Ho Chi Minh City (HCMC), air travel, surface transportation, hotel, restaurants, coffee houses, pubs, attractive places, and spas all contribute to a holistic perceptions of the city's ecosystem. For this study, we selected 812 tourists in HCMC with experience using Web 4.0 and 5.0 devices. We thus tried to explore tourists' previous experience with these tools in various hospitality fields like hotels, spa, bars, and restaurants. HCMC is the biggest commercial hub in Vietnam. Vietnam attracted nearly 18 million tourists in 2019, 60% of whom were Asian (i.e., Chinese and South Koreans), 24% Europe (French and English), 9% American, and 6% Afro-Oceanian [24,25]. Since 2014, Hanoi, Hoi An, and HCMC have been placed in TripAdvisor's top 25 tourist destination list, probably because of its scenic natural beauty, beaches, and opportunity to explore military tourism (i.e., to see archives of history related to Vietnam's war) [26]. HCMC and Vietnam are prominent in deploying new technologies. Since Vietnam is having a rich tourism ecosystem with great hospitality, we selected prominent hotels, spas, restaurants, and bars to use these devices, as these establishments can afford to spend money.
In the recent past, tourism institutions found that the intention to use Web 4.0 and 5.0 devices is always present. Tourists think that these devices can help improve operational efficiency, but simultaneously tourists want human elements to remain [27]. Tourists love to interact with other humans; they think that machines can give more efficient service, but the humanistic touch provides them with a sense of organic happiness [23]. Therefore, somewhere there is a systematic gap between what tourists need and what they can be provided with [28]. Very few research has examined the tourist perspective [8]. Thus, we tried to explain how the gap can be filled by studying the way tourists reciprocate to various services offered by Web 4.0 and 5.0 devices.
Because these devices vary from chatbots to VR/AR, we concentrated on social robots, AR devices, VR spectacles, and chatbots prominent in the tourism ecosystem. This research targeted tourists with previous experience and exposure to these devices while exploring various tourism destinations, so to have a realistic output for the whole HCMC ecosystem and, if possible, Vietnam. We standardized the service aspect to how they are used or how tourists want them to be used for maximum personalized and custom-made services. Social robots are aimed at giving more customized and standardized service when required. Chatbots give digital assistance to physical employees when serving tourists. IVRS helps tourists order services. With VR and AR, the virtual augmented experience can give tourists much needed anxiety and curiosity to explore different services before actually booking them. Thus, these benefits can lift the existing tourism ecosystem and improve tourist satisfaction and loyalty.

Literature Review
Web 4.0 is defined as the machine learning intelligence for robots and chatbots deployed commercially for operational efficiency [29,30]. These devices are programmed to act like human intelligence and perform cognitive and emotive activities. Apple's AI applications, i.e. "Siri", is already familiar to many consumers as an integrated voice-enabled assistance tool. Therefore, conceptualization and operationalization are important for AI-powered devices. The nature of these devices is innate and programmed individually. They are represented as humanoid and related devices or applications. These devices bring significant value to those curious or knowledgeable about such devices. They are programmed to perform economic activities along with regular orderbased tasks. They facilitate employees in their businesses for superior efficiency and uniqueness, and have better-customized outputs and increased job efficiency [31][32][33]. AI-enabled devices are primarily deployed in hotels, spas, bars, and pubs for operational efficacy and to accommodate queries [34]. AI-induced devices have also been deployed into other services [35]. In Perm, Russia, an AI influenced female look-alike robot served as a clerk in public government office [36]. Spot and pepper devices play cheerleaders in empty stadiums for baseball matches in Japan [37]. Robots and AI devices are planned to replace the aging workforce in Japan [38]. A six-foot tall humanoid, Cobo, is a bartender making cocktails in Seoul [39]. These updated deployments of AI induced robots have created a significant uproar of further use in all aspects of tourism services [40]. Tourist engagement is not limited to greeting devices or helping apps, nor planning assistants or directional guides. Rather, they are interactive and more than what tourists expect. As such, Vietnam wants to develop the gross safety and value addition in the existing tourism ecosystem. Web 4.0 and 5.0 devices provide digital expertise to all tourists depending on location and commercial benefit [41].
For Web 5.0 devices, we explored every prominent and available device to signify the service quality and its effect on tourist satisfaction along with loyalty. Tourists try to use the device to get a virtual experience called a "Phygital experience", where the destination and services associated with an ecosystem continuously evolve, which helps virtually represent physicality [42]. This enhances the image of tourism as an aesthetic satisfaction. Web 5.0, enhanced by virtual reality, provides for extensive consumption. The feeling of a virtual environment offers enjoyment and efficiency in destination marketing [43]. The mode of communication provides prominent information about a destination for tourists. They can get more satisfaction by engaging with something new [44]. VR holds a plethora of opportunities for tourism [45]. VR has many tools to boost tourism, i.e., physically they can use a device and virtually have an experience. This dual phenomenon demands attention. The proper planning and management of the entertainment quotient gives a massive boost to heritage tourism [46]. In HCMC, there is the opportunity to utilized VR in military and heritage tourism experiences. Tourists can be shown these things virtually to have the experience of imperial and military history. VR can also help preserve Vietnam's rich flora and fauna. Therefore, virtual and augmented reality is an important development for tourism despite its technical challenges and opportunities.

Web 4.0 and 5.0 Devices and Service Quality
Because Web 4.0 and 5.0 devices commercially develop service quality for various constituents in a tourist ecosystem, they can be considered as an element of service quality for hotels, spas, restaurants, etc. Service quality is regarded as an antecedent of long-term loyalty and satisfaction [5]. Until now, no research has included Web 5.0 (VR/AR) in service quality and its effect on long-term patronage and positive satisfaction. Although some research on hotels and restaurants include social robots and chatbots, not all VR devices are in this same bracket of service quality. Since these have technical implications, prior investigations have indicated the importance of possessing expertise regarding Web 4.0 devices. Still, no study has focused on Web 5.0 devices, which can induce techbased satisfaction and loyalty for tourists. By employing a critical incident method, we observed that self-service has its own positive and negative experiences for tourist engagements [47]. For tourists, self-service generates satisfaction, comfort of use, and punctuality. Yet, above all, it is better than service employees. When technology fails to give instant results, tourists feel bad too. Customer relation management (CRM) is helpful in addressing technology-driven dissatisfaction, as it directly affects the tourists' satisfaction and loyalty [48]. CRM attracts a substantial financial investment. If this can successfully address the concerns of tourists, then it may generate more immediate satisfaction [49]. This techno-service quality has four determinants like prompt tourist service, secure technology for quality information, the comfort of using technology, and trustworthiness of service output. Two factors out of these four are significantly related with tourist satisfaction and loyalty. Thus, we concluded the following hypotheses:

Physical Employee Service Quality and Tourist-Oriented Outputs
The tangibility and intangibility trade-off is integral to service quality [5]. Tangibility is represented by various servicescapes like equipment, tools, and physicality. The intangibility aspect is represented by responsiveness, reliability, trustworthy assurance, and empathetic behavior [50]. Tangible elements are involved with tourist-driven organizations like restaurants, hotels, pubs, etc. They affect the service quality as tourists recognize the differentiation of these services. The line employees are the first point of contact. Therefore, the intangible image of an organization depends on the first point of contact and their behavior is pivotal for service quality perception [51,52]. The popular SERVQUAL model represents reliability, empathy, assurance, responsiveness, and tangibility. The first four factors represent prompt service, accurate and consistent caring, and employee relations. Tangibility factors show the service area and physical appearance of employees. For Web 5.0, employees' behavior and performance are paramount. The perceptual image of employees helps recall an image of the destination by using virtual reality devices [19]. Therefore, the web-based destination image of the tourism ecosystem is crucial for creating a virtual image via a tangible VR or AR tool [53]. The mental image of a place or organization impacts the total tourism ecosystem of a situation [54]. Web 5.0 can help develop virtual reality tourism in a tourism ecosystem [55,56]. Thus, we concluded the following hypotheses: H3: Physical employee service quality is positively related to tourist satisfaction. H4: Tourist satisfaction with physical employees is positively associated with tourist loyalty. Web 4.0 and 5.0 devices not only provide comfort for tourists but they also affect service engagement [6][7][8]57]. A microscopic investigation was carried out for tourist service responses rendered by Web 4.0 and 5.0 compared to physical employee service. When tourists were dissatisfied with Web 4.0 and 5.0 devices, they sought out physical employees [58,59]. Thus, we concluded the following hypotheses: H5: Physical employee service quality shows more variance in holistic service quality than Web 4.0 and 5.0 service quality.
H6: Physical employee service quality shows more variance in holistic tourist loyalty than Web 4.0 and 5.0 service quality.

Research Samples
The authors conduct this research in prominent hotels, spas, restaurants, and pubs where these devices were planned for future. Only tourists with previous experience using devices were encouraged to respond. Tools like social robots, chatbots, digital voice assistance, and VR/AR goggles were standardized.

Research Instrument
Web 4.0 and 5.0 devices vary across the platform of service. Here, we adopted a service quality approach for the devices defined across different blogs [60], which reflects hotel service for tourists with some kind of previous exposure. Device pictures were shown to them and functionality was explained. Mostly, the instrument was prepared in English; we targeted English-speaking tourists. For content validity, we carried out the survey at establishments with preliminary exposure to Web 4.0 and 5.0 devices or establishments who planned to use these devices in the future. We also solicited the opinion of senior managers with more than 10-12 years of experience to validate 15 items in which participants were encouraged to rate service quality on a Likert scale (1 = strongly disagree and 5 = strongly agree). The core items of the questionnaire are detailed in Table A1.
Besides tangibility, we considered the SERVQUAL model's four dimensions for physical employee services. Six items were used for responsiveness, with a Cronbach's alpha of 0.89. Five things were deployed to assess the reliability of service with an alpha value of 0.78. Eight items represented an assurance of service with an alpha value of 0.89. Five items stood for the empathetic service of an employee with a Cronbach's alpha of 0.82. One item represented tourists' overall perception of service quality.
Tourist satisfaction with the service quality of Web 4.0 and 5.0 devices was measured by three items [61,62] that represented overall satisfaction and physical employee services (the Cronbach's alpha was 0.79 and 0.81, respectively). Tourist loyalty was measured by items such as if they gave referrals, reviewed positive electronic word of mouth (e-WOM) on various platforms, or were willing to pay a premium price for these services [63]. Here, the alpha value was 0.86, with responses recorded on a Likert scale (1 = strongly disagree and 5 = strongly agree).
We also collected 10 responses from the staffs at hotels, spas, bars, and travel establishments who deployed devices to have a distinctive technical value added to their services. We selected such establishments with good reputations and popularity among English-speaking tourists. The short interview schedule featured five subjective questions regarding awareness and technical know-how for Web 4.0 and 5.0 devices. Apart from these five questions, we also asked what they thought of devices and how they perceived their impact on service. We prepared the questions in English and field data collectors explained them to participants in Vietnamese after responses were collected. After, they were again translated to English from Vietnamese. Participants were selected based on their experience (8 to 12 years of active engagement) in the sector and knowledge of new developments.

Data Collection
After consulting with the managers of various tourist establishments, we finalized the dimensionality for the devices. The survey questionnaire was prepared in such a way that face validity was confirmed and responses were recorded in 10-15 minutes. As such, respondents' fatigue was prevented [64]. Yet there were some gaps for when we selected 812 samples from 834 returned responses. A pilot test also confirmed minor modifications to the items with 30 randomly collected responses. Field survey assistants received responses from tourists with prior permission from the establishments, who encouraged them answer with a free mind. They even provided tourists with candies as a token of appreciation. Moreover, some responses were collected via social platforms like Facebook groups and Zalo, where the questionnaire was administered via the Survey Monkey website as an economical method of collecting responses [65].
.We tried to minimize the common method bias for the survey by selecting Tabachnick's pretested format [66]. Questions did not have any ambiguity. Respondents were informed at the beginning of the survey that their responses would be used for academic research and no business propositions would be made. They were free to answer how they chose. Table 1 shows responses from 812 tourists, where the total number of responses by demographic representation can be seen. The study consisted of 508 males and 304 females. Age classifications were distributed over six segments. The education level of tourists was divided into four categories. Annual income in US dollars was split into six segments. Employment level of tourists was split into five segments. Marital status was split into three segments.  Table 2. The first question we asked was what they knew about devices; pictures were shown to them. Second, we asked how they thought devices would impact the operation of tourism services. Third, we asked what were factors of good service and how they impacted working culture. Fourth, we asked how these devices affected the overall satisfaction in comparison to physical service. Fifth, we asked how they assessed loyalty for these devices compared to physical service

Analysis of Data
When judging the factorial validity of Web 4.0 and 5.0 device service quality scales, we randomly segregated samples (no distinct difference in t-tests and Chi-square tests) into two parts for exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) [67]. After applying EFA to the first division of samples, we found a five-factorial framework (χ 2 = 56.57; degree of freedom = 40; CFI = 0.99; TLI = 0.98; RMSEA = 0.05). Therefore, the items of the reciprocating dimension reliably loaded after conducting CFA on the second set of samples, which undermined the goodness of fit in the EFA structure. The results were as follows: χ 2 = 537.14; degree of freedom = 80; CFI = 0.95; TLI = 0.95; RMSEA = 0.09. The items reasonably accepted factor loading for each factor with an excellent composite reliability (CR) and average variance extracted (AVE) ( Table 3). This showed a good, acceptable convergent validity (CV) and the square root of AVE was more than inter-factorial correlation, which suggested good discriminant validity (DV). For investigating Web 4.0 and 5.0 devices and physical employee services impact on tourist satisfaction and loyalty, two factors were considered as second-order factors for knowing the holistic impact. They were treated as a first-order factor to judge the effect of each element on the outcome. The sub-dimensional items underwent first-order factors to deduce the overall holistic effect. The second-order CFA goodness of model fit index for both Web 4.0 and 5.0 devices and physical employee service was found to be acceptable, as shown in Table 4. The path coefficients and firstorder factor structure were significant at a 0.05 level of significance. Moreover the goodness of fit for the second-order dimension model after a one factor CFA averaged the was also found to be acceptable [68]. This showed that the second-order factor model for two constructs was acceptable for consequent correlation testing, as represented by Table 5.

Hypothesis Testing for the Factors.
Before testing our hypotheses, we evaluated how web devices and physical employee service quality were reciprocated in overall service quality. Web devices were found to contribute 20% to overall service quality, whereas physical employee service contributed 65% to overall service quality. Therefore, physical employee service was evident. Table 3 shows that the digitalized support from chatbots and robot-and AR-induced auto data management had almost no effect on web device service quality. On the other hand, the responsiveness of physical employees did not impact total service quality. While applying the regression on all web devices and physical employee service quality, we observed that the web device and their service quality negatively affected overall service quality. In contrast, physical employees and their service quality was found to be positive.
Results of hypotheses 1 and 2 showed that Web 4.0 and 5.0 device service quality had a positive effect on tourist satisfaction (ß = 0.41 at p < 0.001), which influenced tourist loyalty (ß = 0.25 at p < 0.001) at a 95% confidence interval. Web 4.0 and 5.0 device service quality also had a direct effect (ß = 0.26) and an indirect effect (ß = 0.16) at p < 0.001 on tourist loyalty, as represented in Figure 1. Similarly, with regard to physical employee service quality, we observed that it positively impacted tourist satisfaction (ß = 0.38). It also affected tourist loyalty (ß = 0.28) at p < 0.001 and a 95% confidence interval. Physical employee service quality also had a direct effect (ß = 0.48) and an indirect effect (ß = 0.39) at p < 0.001 on tourist loyalty, as shown in Figure 2.

Figure 2.
Relationship between physical employee service quality, tourist satisfaction, and loyalty at p < 0.001.
Since a confidence interval of 95% did not overlap with these relations, we can safely state that tourist satisfaction and physical employee service quality have a stronger effect on tourist loyalty than Web 4.0 and 5.0 devices.
With further analysis of web device service quality, physical employee service quality, and their respective effect on tourist satisfaction and loyalty, we observed that social robots have a strong influence on overall service quality and reliability, as well as a substantial impact on tourist satisfaction. However, no physical employee service quality dimensions were significant for tourist loyalty, as shown in Table 6. For testing hypotheses five and six, both web devices and physical employee service quality were subject to regression. We observed that the impact of Web 4.0 and 5.0 device service quality was negative when evaluating service quality. In contrast, physical employee service quality held strongly in this category. We also observed that other than empathy shown by physical employee service quality, none of the dimensions significantly affected tourist loyalty, as shown in Table 7. Hence, this supports hypotheses 5 and 6.

Findings
Our findings indicate that tourists prefer to interact with social robots, finding them relatable, human-like, empathy-possessing, and a strong capacity to process information, which is still not available with other web technologies [57]. Web 4.0 devices like social robots are accepted by tourists, but Web 5.0 devices have evolved. Tourists were not able to differentiate VR and AR devices, nor their use as social robots; maybe they assumed that AR and VR devices were extensions of these robotic technologies. Once empathetic and information processing abilities are integrated into Web 5.0 devices, we are sure that they will have more acceptance than any other service quality possibility. IVRS and chatbots are becoming quite common and tourists' level of curiosity and use is not entirely exhibited. Thus, they need innovations and more differentiation.
Among physical employee service dimensions, reliability and assurance were found to strongly relate to tourist satisfaction, whereas responsiveness and empathy had an insignificant effect. This proves that tourists depend on physical service. The credibility and trustworthiness of employees is paramount for tourist satisfaction. Assurance and reliability represent the overall service quality for different services in the tourism ecosystem. Like most big hotels, they must provide inhouse services like a spa, masseuse, pub, bar, and sightseeing activities. With regard to empathetic services, we found that tourists were in favor of web devices, as such devices are programmed to offer standardized tools, where information can be processed more accurately than humans [7]. We found that tourists were mostly in favor of digitalized services because they did not want to interact with employees more than they had to. Surprisingly, no dimension had a direct effect on tourist loyalty, which was antagonistic in previous research [63]. Therefore, we believe that physical employee service can only attract long-term patronage, as machines cannot satisfy this hospitality goal. Each service encounter has to be accountable for tourist responses so that they can enhance service quality and tourist satisfaction.

Discussions
This research discusses the role of Web 4.0 and 5.0 devices for commercial sustainability in Ho Chi Minh City (HCMC), Vietnam's tourist ecosystem. The aim of this study was to commercially examine the viability of Web 4.0 and 5.0 devices for the tourist use. Further, we aimed to determine how much these devices could generate satisfaction and loyalty in the minds of tourists, especially when compared to physical services. These are duly discussed in Tables 6 and 7, and Figures 1 and  2. This study focused on a pilot project that implemented Web 4.0 and 5.0 devices in the HCMS tourist ecosystem. Both military and adventure tourism were targeted. With AR and VR goggles, leisure tourism can be developed. Due to COVID-19, using these machines are fruitful for the tourism industry. In the wake of restrictions on employee services, these tools proved highly beneficial for the tourist ecosystem. With VR and AR, tourists can experience a place before visiting. In Japan, they have made dummy flights using goggles for a virtual experience. In Vietnam, the tourism industry can plan to provide a virtual trip where travel is otherwise not possible because of COVID-19 restrictions. In Vietnam, cave tourism is also prevalent, but caves are difficult to access during the rainy season. However, these places and their experience can be promoted through virtual augmented devices. If establishments like hotels and spas know what tools to appropriately use with tourists, they will save money. In spas, the human element may not be used even when COVID-19 restrictions are lifted, but social robots can be used to resume service. This will create interest, despite the lack of the human element.

Future Scope
The key operationalized elements of satisfaction and loyalty coexist in tourists' minds. Therefore, we are curious how to best incorporate the physical aspect of service. To do so, we need to conduct difficult research to examine the perceptual and neurological dimensions of tourists. We hope this study adds insights to such a necessary research conversation. This study is unique in the sense it considers both AI and VR. We did not differentiate between devices, but nonetheless explored the service quality of these devices and empirically compared them to physical service. From a tourist's perspective, these devices represent a nascent use of new technologies, which may prefigure future technologies, especially in the wake of COVID-19. Indeed, visitors are both curious and anxious to use these devices. Our findings suggest that physical employees must find specific roles beyond standardized service because Web 4.0 and 5.0 devices are better at accomplishing these services. Yet machines cannot replace human beings in the tourist ecosystem until techno-loyalty and fully techno-empathy practically occur.

Conclusions
This research examines how Web 4.0 and 5.0 devices impact service quality and tourist loyalty compared to physical employee service in HCMC's tourist ecosystem. Our findings indicate VR and AR innovations in this tourist ecosystem. Web 4.0 devices like social robots benefits tourist satisfaction. Hopefully, with their empathetic activities and information processing, promptness can win tourists' loyalty in the long run. Although machines cannot replace humans, they can undoubtedly be assets in areas where humans may lack. Furthermore, they can support various establishments where human behavior may not give appreciable satisfaction and long-term patronage. We also considered the opinions of senior employees. Since different establishments spend a lot of money to deploy these devices, they hope that the usage of these devices improves tourist satisfaction and loyalty. Otherwise, they may incur unnecessary expenses which will have less return.
This study is suitable to improve the service quality of various tourist. These techno-human combined aspects can help better position and develop a unique platform in this ASEAN region. Tourist loyalty and satisfaction may showcase HCMC as a tech-driven destination in the world's future tourism map. Some experts have raised the issue of job loss and lack of human involvement.
We can only conclude that this aspect needs to be better researched after the deployment of these devices and applications. Not addressing this future research topic is a limitation of the present study [69][70][71]. We also did not consider tourists with no previous Web 4.0 or 5.0 device experience. People without such experiences could offer a substantial contribution to the future scholarly conversation [72,73]. In the wake of COVID-19, these devices can help revive the tourism and hospitality sectors, such as wellness tourism, military tourism, and cave tourism. For as long as physical employee services are not restored, establishments can use devices to attract tourists. Web 4.0 and 5.0 applications enhance one's technological experience If managed properly, they can give a boost to one's leisure experience.
In this study, we assisted non-academic experts like senior employees to prepare a questionnaire, which may be one of our study's limitations. Because this study is based in Vietnam, we did not consider other countries. In Vietnam, luxury hotels provide most accessory services to tourists. Thus, future research might examine a luxury hotel with more specialized  Table A1. Questionnaire items given to tourists.

Questionnaire Main Items
Social Robots Item 1 You follow and like the suggestions of sightseeing from social robots Item 2 You feel happy when the robot responds to your queries Item 3 You like the games the robots plays or suggests while you wait Digitalized support by Chatbots Item 4 You are happy to have a prompt access to service Item 5 You do not have to wait for any online query with Chatbots Item 6 You like the itinerary scheduling done by Chatbots IVRS support by Robots Item 7 You like to order food using IVRS support Item 8 You like the robot's advice on the special menu Item 9 You prefer the IVRS of robots to assist in regulating temperature and room lighting VR travel and sightseeing experience enhancement Item 10 You like the attractive places and know it better through VR devices Item 11 You prefer the virtual promotional offers and advertisements in VR Item 12 You feel good using VR for booking and experiencing routes Auto Data management; Robots with AR Item 13 You prefer customized offers given by data management devices with AR Item 14 You like how AR remembers your preferences and website browsing history Item 15 You appreciate the return journey assistance given by the devices