You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, let me know your travel dates?

USER: My travelling dates are from Feb 17 - 19.

ASSISTANT: Do you have any requirements for the journey?

USER: I prefer for business class with single connection.

ASSISTANT: Can you mention your name please?

USER: Kevin Lee.

ASSISTANT: Sorry, no flights found with your requirements.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.