Build very simple hotel reservation platform with Excel Visual Basic.

I need very simple hotel reservation system for my bigger project. It's supposed to be very basic "show off" how the end product will look like. The product does not need to be very polished, but it needs a couple of basic functions. It does not need to be secure, database can be flat file etc. All the files must be included in same folder. So about the project itself. Room reservation system for small hotel. Only one access to adminstrator, no need for other users. Simple login, with "admin" username and "admin" password. You must be able to make reservations, delete reservation, modify and view reservations in calendar, which shows 1 week at a time. The reservation can be done to one day at a time, it doesn't need to be for many days. If I want to reserver room for many days, I can just make multiple reservations one after one. There should be couple of different type of rooms. Again, this is VERY simple and plain show-off how something else will look like in the future. It must be very simple and straightforward to use, no need to take care of security. Everything can be stored in plain text files, no need to encryption or databases. The code must include understandable comments, so I can modify and develop it further. MUST BE DONE WITH EXCEL VBA. Attached to very simple idea how the calendar should look like. There should be login page too (admin username, admin password).