Below is a vision document and use case diagram, can someone help me with a preliminary ERD Model using the info provided?

'Problem Description: Customer Service has been an important part of the Airline Industry for a long time. Without it, there would be a decline in customers purchasing flight tickets to different countries. The problem nowadays is that Customer Service is not that responsive, and even with the slightest delay, it could cost the customer/passenger an inconvenience. Since, security checks in Airports has become stringent, and by adding a delay by Customer Service, customers have very little time to leisure around the airport before boarding begins. Therefore, an App will be developed which the customers can download, and through the App, the staff will instantly be able to communicate with the customers if they have any queries. The app is also an online store of the Duty Free Shop, where they can buy any of the products of their interest and is capable of doing many more functions. This app could be downloaded by both iOS and Android users. System Capabilities: The system should be capable of doing: - Answering customers at a quick pace without making them wait for a long time for a response. - Allows the Customer/Passenger to select their native language, if they are unfamiliar in speaking English. - With the language selected, AI will be able to answer with pre-loaded automated messages. - Will learn to adapt to different responses as time goes on. - Telling the Passengers where they need to board, where their Gate is, which conveyor belt they will receive their luggage at, - Allows the passengers at the Airport to connect to the Airport's WiFi automatically. - By collecting Customer Data through their search history in the app, the system will recommend products to the Customer according to their taste. - Allows Flight rescheduling if flight has been missed. - Shows the Hotel room availability according if flight has been missed. - Automatic recognition of Loyalty Program Status. Business Benefits: By deploying the following system, it'll provide the following business benefits: - Reduces the amount of staff members behind desks currently at the airport. - The App is integrated through all the airline companies in the Airport. - Increases Efficiency by reducing the amount of work done manually. - Gives a good impression of the airport, thus making the customers come to the airport. - Sales of the products in the airport will increase. - Decreases the Salary Expense in the long run.