You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I oblige you today?

USER: I am Cynthia Hall. I need to book a flight ticket from DFW to DTW, Can you please help me for booking with direct flight?

ASSISTANT: Sure, please let me know your planned travelling dates.

USER: I would like to travel on 12/18 to and return on 12/20.

ASSISTANT: Kindly share your destination point.

USER: Already mentioned above.

ASSISTANT: Ok, can I know your price limit?

USER: I can pay up to 200.

ASSISTANT: Please wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, no problem.

ASSISTANT: Thanks for picking us.

USER: Thanks for your information.