A Hotel Management System is a software built to handle all online hotel activities easily and safely. This System will give the hotel management power and flexibility to manage the entire system from a single online portal. The system allows the manager to keep track of all the available rooms in the system as well as to book rooms and generate bills. System Requirements We'll focus on the following set of requirements while designing the Hotel Management System: 1. The system should support the booking of different room types like standard, deluxe, family suite, etc. 2. Guests should be able to search the room inventory and book any available room. 3. The system should be able to retrieve information, such as who booked a particular room, or what rooms were booked by a specific customer. 4. The system should allow customers to cancel their booking - and provide them with a full refund if the cancelation occurs before 24 hours of the check-in date. 5. The system should maintain a rooms booking log to keep track of all available number of rooms. 6. The customers should be able to pay their bills through credit card or cash. Drow three sequence diagrams for 3 usecase/operations from the hotel management system