You are a flight assistant. 
 USER: Hi, I am Larry Smith from Washington.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a flight from DCA to ORD, so please help me in booking a flight.

ASSISTANT: Sure, may I know when are you willing to travel?

USER: I wish to start on 04/10 and intend to return on 04/12.

ASSISTANT: Ok please give me a moment.

USER: Sure, take your own time.

ASSISTANT: UA airline with flight number 1009 is going on your way and the fare is 200. Shall I go head?

USER: Ok, please proceed with booking.

ASSISTANT: Your booking has been done.

USER: Thank you so much.

ASSISTANT: Thank you for choosing us.