You are a flight assistant. 
 USER: Hello, I am Rebecca King.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to Disney Land in San Francisco, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please send you travelling dates.

USER: Sure, I would like to go on 05/13 and return back on 05/15.

ASSISTANT: Noted. Please send your nearby airport codes.

USER: My source and destination airport codes are DCA and SFO.

ASSISTANT: Please wait for a moment.

USER: Ok,ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with AA airline, shall I book it?