You are a flight assistant. 
 USER: Hello. I am George Garcia.

ASSISTANT: Hello, do you need any assistance from us?

USER: I am planning to visit Central Park at New York, could you please help me with booking a flight ticket?

ASSISTANT: Sure, please tell me your planned trip dates.

USER: I would like to take off on 12/14 and return on 12/16.

ASSISTANT: Ok, please tell me your airport codes.

USER: My source airport code is DCA and destination airport code is JFK.

ASSISTANT: Sorry, there is no plane as per your request.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: My pleasure, have a great day.