MANAGEMENT SYSTEM for HOTEL on android or website , whatever u like

i will give an example of what i want in the end but read this data too after the applictaion is made and paid i will be keeping u in touch and for that i may be paying u monthly fees or etc i want a system which will be used by 20-25 people with 3 categories 1) Admin 2) managers 3) agents i want a simple android application or webpage that will keep a record of the number of rooms availabe and let managers and admins accsess them managers can only read the numbers of rooms and the name of the person that reserves it this data is added by admin agents can only place a request for reservations which will enter the data base only if avaiability is there managers can see the booking only of the current day admins can see and adjust the bookings for any day agents can only place request for reservation any day I JUST WANT A SIMPLE APPLICATIONS NOTHING FANCY REQUIRED U CAN TELL ME WHAT U WILL REQUIRE FOR THIS LIKE A SERVER OR SO BECAUSE I HAVE HEARD ONLINE APPLICATION REQUIRES THEM EXAMPLE p1 is an admin p2 is an manager p3 is and agent there are 13 rooms that can be reserved senario 1 assume today is 28 jan eg current data base that is edited by admin 31 jan , 3 booked , 10 available , 0 contionued from previous day, 0 rooms leave today , 0 new rooms 1 feb , 6 booked , 7 available , 3 continued from previous day , 3 new rooms , 0 rooms leave today 2 feb , 5 booked , 8 available , 4 continued from previous day , 1 new rooms , 2 rooms leave today 3 feb , 9 booked , 4 available , 3 continued from previous day , 4 new rooms , 2 rooms leave today extra note :- this data will not be stored like this it will also contain the name and phone number of the people reserving the rooms too, any amount of rooms and be placed under one name and number like --------------------------------------------------------------------------------------------------------------------------------- date | name | phone number | number of rooms 1 feb bob 0123456789 3 --------------------------------------------------------------------------------------------------------------------------------- ^^^ now all these were placed by P1 \ \ P2 can see all of these and can just read this data in a tablular form like shown here| now P3 places a booking for rooms on 1,2,3 feb which means 3 days for 3 rooms admin will now receive booking and review it if he accepts it it gets registesterd into data and send a notification to P3 that the booking is confirmed or if rejected send a notification to P3 that booking has been rejected nothing more than this senario 2 if the number of rooms reserved exceeds the limit of eg 13 then the rooms go into an extra category that will be maybe in a different color like grey the three categories will divided with different kinds of accounts which will be made by a simple account system , by default an account made will be a agent account but i will tell u which account to put under the manager and admin category . thanks that's all of my requests i will update u further on your acceptance and u can also suggest some changes its difficult to explain on this so contact me if u are intrested