Below is a System Sequence Diagram for a reservation system, which highlights the interaction between external actors (e.g., customer, administrator) and the system during a reservation workflow:

sequenceDiagram participant Customer participant System as Reservation System Customer ->> System: Enter reservation details System -->> Customer: Validate inputs Customer ->> System: Submit reservation request System ->> System: Check resource availability alt Resource available System ->> System: Create reservation System ->> Customer: Confirm reservation System ->> System: Trigger payment process System ->> Customer: Notify payment status else Resource not available System ->> Customer: Display unavailability message end

Explanation of the Diagram:

  1. Actors and System:

    • The Customer interacts with the Reservation System to complete a reservation process.

  2. Key Interactions:

    • The customer enters reservation details, and the system validates the input fields.
    • After submission, the system checks if the requested resource is available.

  3. Decision Point:

    • If the resource is available, the system:
      • Creates the reservation record.
      • Confirms the reservation with the customer.
      • Triggers the payment process and communicates payment status to the customer.
    • If the resource is not available, the system informs the customer with an appropriate message.

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