You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from JFK to ATL. Could you help me in booking?

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

USER: My travelling dates are from Mar 29 - 31.

ASSISTANT: Do you have any other requirements?

USER: I prefer for direct flight.

ASSISTANT: Can I know your name please?

USER: Helen Jackson.

ASSISTANT: Please wait.

USER: Ok.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: Most welcome.