You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from ORD to ATL, Can you please help me for booking?

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

USER: I would like to travel on 04/18 to return on 04/20.

ASSISTANT: Do you prefer break in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: Yes, I need a business class.

ASSISTANT: Can I have your good name please?

USER: William Anderson here.

ASSISTANT: Sorry, there are no business class tickets available on those dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.