You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to book a flight ticket from MSP to DFW. Can you help me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, my planned trip dates are on Feb 17 and Feb 19.

ASSISTANT: Can I know your preferences?

USER: Yes, I want business class.

ASSISTANT: Do you need any specifications?

USER: I want to return in the afternoon time.

ASSISTANT: Can I know your name please?

USER: Yes, I am Deborah Mitchell.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, not an problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.