You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a business class flight ticket?

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

USER: My travel dates are July 14 and July 16.

ASSISTANT: Ok, what are your source and destination airport codes?

USER: My nearest airport codes are DEN and DTW.

ASSISTANT: Ok, please tell me your connection limit preference.

USER: I am comfortable with any connection.

ASSISTANT: Ok, what is your full name?

USER: I am David White.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights available in  this route.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome. Thank you for choosing us.