You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Atlanta, can you please book me a ticket from JFK to ATL?

ASSISTANT: Sure, may I know your trip dates please?

USER: My preferable journey dates are Mar 27 and Mar 29.

ASSISTANT: Do you have any other requirements?

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

ASSISTANT: Can I know your name please?

USER: My name is Jeffrey Baker.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

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

ASSISTANT: My pleasure.