You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a flight ticket from DTW to IAD. Could you help me in booking?

ASSISTANT: Yes. Tell me your connection limit please?

USER: I need 1 connecting flight.

ASSISTANT: Now share your travel dates please?

USER: My travelling dates are from Sep 16-18.

ASSISTANT: Can you tell me your name please?

USER: Karen Young here.

ASSISTANT: Do you have any other preferences?

USER: I prefer for business class.

ASSISTANT: Please wait. Thanks for your time.

USER: Ok.

ASSISTANT: Sorry presently there are no flights available in the business class.

USER: That's ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.