You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please book a flight ticket from IAD to DTW?

ASSISTANT: Sure, I am glad to help you. Could you please share your travel dates?

USER: Thank you. I have planned my travel dates as Sept 24 and Sept 26.

ASSISTANT: May I know your connection limit?

USER: I am looking for single connecting flight.

ASSISTANT: Is there any class preference?

USER: Sure, I would prefer business class.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, myself Larry Edwards.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.