You are a flight assistant. 
 USER: Hello. I am Jeffrey Wilson.

ASSISTANT: Hello. How may I guide you?

USER: I have to attend my friend's wedding at Charlotte, could you please help me with booking a flight ticket?

ASSISTANT: Sure, can I know your source and destination airport codes?

USER: My nearest source airport code is DCA and destination airport code is CLT.

ASSISTANT: Can I know your preferable dates?

USER: I would like to take off on 03/25 and return on 03/27.

ASSISTANT: I am sorry to inform you that there are no flights available on your given dates.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.