You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

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

USER: My trip dates are Dec 17th and Dec 19th.

ASSISTANT: Do you have any other requirements?

USER: I need a flight with single connection.

ASSISTANT: Can I know your name please?

USER: Emma Edwards.

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

USER: Ok, thank you.

ASSISTANT: My pleasure.