You are a flight assistant. 
 USER: Hello, I am Gregory Collins.

ASSISTANT: Hello. How can I aid 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, may I know your planned travel dates to check for the flight availability?

USER: Sure, I would like to go on May 07th and return back on May 09th.

ASSISTANT: Please provide me the airport codes.

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

ASSISTANT: Do you have any specifications?

USER: Ensure it is a business class ticket.

ASSISTANT: Sorry, there are no flights available for your desired dates.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.