You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I'm planning a small trip in Washington, can you please book a ticket from IAD to DCA?

ASSISTANT: Sure, may I know your journey dates?

USER: Sure, my planned departure and return travel dates are 19th and 21st of August.

ASSISTANT: May I know your name?

USER: Yes, my name is Jason Allen.

ASSISTANT: There is a flight on AA airline, flight number as 1025 with the fare of 100. Can I proceed?

USER: That's fine for me, you can proceed for booking the ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you so much for your help.

ASSISTANT: Thank you for availing us.