You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I'm Michelle Mitchell. I am planning to attend music concert at Washington, can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source airport code is PHL and the destination airport code is DCA.

ASSISTANT: May I know your travel dates please?

USER: Sure, I would like to take off on 08/09 and return back on 08/11.

ASSISTANT: Just a moment please.

USER: Ok, but please make sure that the connection limit is 1.

ASSISTANT: I am sorry to say, no flights available on your rough.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us. Have a nice day.

USER: You are welcome.