You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you today?

USER: I am planning to book a flight ticket to DEN from ATL, can you please help me out?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: Sure, my planned travelling dates are Sept 23 and Sept 25.

ASSISTANT: May I know your name for further process?

USER: Sure, my name is David Roberts.

ASSISTANT: Do you have any connection limit for this trip?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Do you have any another specifications?

USER: Yes, I prefer business class.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.