You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to meet my brother at Atlanta, please help me to book my flight ticket from JFK to ATL.

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

USER: Thank you. I will depart on May 25th and return back on May 27th.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Can I know your name please?

USER: My name is Carol Allen.

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

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.