You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Walker.

ASSISTANT: How may I support you today?

USER: I am planning to book a ticket from ATL to ORD. Can you please help me out?

ASSISTANT: Sure, we are here to make your journey comfort. Please let me know if you need a connecting flight.

USER: I am planning to travel on Jan 22 and return back on Jan 24.

ASSISTANT: Ok.

USER: I am looking for a connecting flight.

ASSISTANT: Sure, may I know if you prefer to have any other comforts in your journey?

USER: Yes, I am looking for a business class and my return time should be evening.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for approaching us.