You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am looking to book a flight ticket from DTW to CLT. Can you help me for that?

ASSISTANT: Let me know the travel dates?

USER: My travelling dates are June 08 and June 10.

ASSISTANT: Is there any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any class preferences?

USER: Just now, I have changed my decision, please search a direct flight in my journey. I prefer to book a economy class.

ASSISTANT: Sure, are there any more preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Gary White.

ASSISTANT: Sorry to inform that there are no flights on your route withe given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.