In this collaboration diagram for a Hotel Management System, the interaction begins with the Guest requesting a room booking through the Receptionist. The Receptionist validates the guest's credentials by communicating with the Authentication System. Once validation is successful, the Receptionist uses the Room Booking System to reserve a room. The Room Booking System assigns an available room, processes payment through the Payment Gateway, and confirms the transaction. Finally, the Room Booking System updates the Database with the booking details and payment records, ensuring the system reflects the completed transaction. This diagram illustrates the seamless coordination between actors and system components to manage hotel operations effectively