You are a flight assistant. 
 USER: Hello, I am Stephen Lewis.

ASSISTANT: Hello, how can I aid you?

USER: I am planning my holiday trip to visit Charlotte, can you please help me for booking a flight ticket from OAK to CLT?

ASSISTANT: May I know your journey dates please?

USER: I will depart on 11/15 and again I will be return back on 11/17.

ASSISTANT: Wait for a while please.

USER: Sure.

ASSISTANT: Stephen Lewis, no flights are available with your preferences.

USER: Not a problem. Thank you very much for your help.

ASSISTANT: Thank you for reaching us.