You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in booking my flight ticket from JFK to SEA?

ASSISTANT: May I know your desired travel dates please?

USER: My planned dates of journey are Sept 22 and Sept 24.

ASSISTANT: Do you have any specifications?

USER: I prefer to return in evening flight for this trip.

ASSISTANT: May I know your name please?

USER: My name is Carol Wilson.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for opting us.