You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am planning to book a ticket to meet my friend at DTW. Can you please help me out from IAD?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I would like to travel on Jan 31 and return back on Feb 02.

ASSISTANT: Ok, please let me know your preferable class to get best flight for you.

USER: I am looking for a business class.

ASSISTANT: Ok, do you want any breaks in between your journey?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Can I have your good name please to proceed further?

USER: I am Kimberly King.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Kimberly King, no flight is available to you in business class on your dates.

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

ASSISTANT: Thank you for choosing us, have a good day.