You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in booking a flight ticket to ATL from BOS in March month?

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

USER: Sure, my trip dates are Mar 18 and Mar 20.

ASSISTANT: Do you have any other requirements please?

USER: I need a connecting flight which departure in the afternoon.

ASSISTANT: Can I know your name please?

USER: Sure, my name is Shirley Miller.

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

USER: Not a problem, anyways thank you for the information.

ASSISTANT: My pleasure.