Here is an uml sequence diagram of online booking system. It starts with the participant, namely the customer, and displays messages and method calls represented as arrows or lines connecting the objects. The objects are arranged horizontally, with time progressing from left to right. The arrows connecting the objects represent the flow of messages and interactions between them. Sequence diagrams are often used in conjunction with other UML diagrams, such as class diagrams and activity diagrams, to provide a comprehensive model of a system.
