This communication diagram illustrates the process of a railway reservation system. The passenger requests ticket booking, which is handled by a clerk. The clerk interacts with the train schedule system to check train availability and receive schedule details. Once availability is confirmed, the clerk inputs passenger and train details into the reservation system. The system then initiates payment through a payment gateway, which processes and confirms the payment. Upon successful payment, the reservation system reserves a seat and sends booking confirmation to the notification system, which relays the confirmation message back to the passenger.
