(PYTHON) I need help coming up with some class structure for a reservation system. Can anyone give some tips or a basic uml diagram. I will thumbs up any effort at help here.

Here is the project description I came up with: This is for a hotel (rooms, service, costs, etc.)

• A text-based user interface which can be used to check if a date/time is reserved and to make a reservation for a chosen time.
• The program prevents concurrent reservations and, if needed, informs the user about the resource already being reserved at the given point of time.
• The program marks the chosen resource as reserved for the given points of time.
• The program can be used to save information on customers (e.g. name, address, phone number and e-mail) and to connect it to a reservation.
• The reservations dont disappear when the program is closed, meaning they can be saved into and loaded from separate files.
• A graphical user interface which includes a calendar view that shows reservation times of the resources and can be used to make new reservations.
• The program saves history data on customers/services provided (e.g. basic information and maintenance history of a car), which can be searched and viewed.
• The reservations can be of different lengths.
• Unittests for at least part of the program

Any tips would be really helpful as well! If you could add some data structures that would be awesome as well