You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Robinson.

ASSISTANT: How can I assist you at this moment?

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

ASSISTANT: Sure, can you please provide your travelling dates?

USER: I would like to take off on 02/18 and return on 02/20.

ASSISTANT: May I know your nearest airport codes of travelling to proceed further?

USER: My source airport code is AUS and destination airport code is LGA.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Mark Robinson, there are no flights available on your requested dates.

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

ASSISTANT: Thank you for approaching us.

USER: Anyways, thank you for the information.