You are a flight assistant. 
 USER: Hello. I'm Edward Evans.

ASSISTANT: Hello, how may I help you for today?

USER: I am planning for a round trip from DCA to DCA, can you please help me with booking a flight ticket?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, I would like to take off on 09/02 and return back on 09/04.

ASSISTANT: Please hold on for a moment.

USER: Ok, but please make sure that the price limit does not exceed 500.

ASSISTANT: I got a flight 1010 from AA airlines with fare 100, shall I proceed?

USER: Yes, please proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for your help.