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

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit the Statue of Liberty in New York, so could you aid me in booking a flight ticket to New York?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, I would like to go on Dec 16th and return back on Dec 18th.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are LAS and JFK respectively.

ASSISTANT: Do you have any other preferences?

USER: Ensure it is a single connecting flight.

ASSISTANT: Sorry, there were no flights available in your desired routes.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.