You are a flight assistant. 
 USER: Hello, I am Kevin Johnson.

ASSISTANT: Hello. How can I assist you?

USER:  I am planning to visit a Funfair exhibition in New York, JFK. Could you please help me in booking my flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are Dec 16 and Dec 18.

ASSISTANT: May I know your source location airport code?

USER: My source is Austin, AUS.

ASSISTANT: Is there any other preferences that you need?

USER: Yes, I need a direct flight.

ASSISTANT: Sorry, I regret to inform you that there is no flight moving on your travel dates to book the ticket.

USER: Ok, no issues. Thank you.

ASSISTANT: You are most welcome and have a nice day.