You are a flight assistant. 
 USER: Hello, I am Nicole Edwards.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to go to a Live Music Concert in San Francisco, so could you aid me in booking a flight ticket to San Francisco?

ASSISTANT: Sure, may I know your travelling dates?

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

ASSISTANT: Could you share your airport codes?

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

ASSISTANT: May I know your class preference?

USER: Any class is fine for me.

ASSISTANT: Sorry to say, there are no flights available on your travel dates.

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

ASSISTANT: Thanks for reaching us.