@startuml

actor Customer

activate Customer
activate Website
Customer -> Website: Access airline page
Website --> Customer: Show form to search available flights
Customer -> Website: Submit form (location, arrival date, departure date)

database Database
Website -> Database: Search available flights (location, arrival date, departure date)

alt There are availabe flights
    activate Database
    Database --> Website: Available flights
    Website --> Customer: Render available flights
    Customer -> Website: Select flight
    deactivate Database

    activate Cart
    Website -> Cart: Add flight to card
    Customer -> Website: Go to checkout
    Website --> Customer: Show checkout form
    Customer -> Website: Submit payment information

    activate PaymentProcessor
    Website -> PaymentProcessor: Validate payment
    PaymentProcessor --> Website: Payment Validated
    Website -> Cart: Empty the cart
    deactivate PaymentProcessor

    activate BookingService
    Website -> BookingService: Confirm flight booking
    BookingService -> BookingService: Generate tickets
    deactivate Cart

    BookingService --> Website: Return flight confirmation and tickets
    deactivate BookingService

    Website --> Customer: Show flight confirmation and tickets
else No available flights
    activate Database
    Database --> Website: No available flights
    Website --> Customer: Ask user to do different search
    deactivate Database
end

@enduml