You are a flight assistant. 
 USER: Hello. I am James Allen.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to fly from Washington DC-IAD, to meet my sister after a long time. Would you please aid me in booking a flight ticket?

ASSISTANT: Sure, when would you like me to book a flight ticket?

USER: My depart will be on 05/31 and return on 06/02.

ASSISTANT: Can I know your destination  airport code?

USER: My destination airport code is DC-DCA.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: We found a Delta airline with fare of 200 and a halt in between the journey matches your travelling schedule. Can I proceed with booking?

USER: You can proceed.

ASSISTANT: Your ticket has been confirmed with flight number 1000.

USER: Thank you.

ASSISTANT: Thank you for your availing us.