You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Kevin Clark here. I want to travel from DTW, on 08/28. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you. May I know your return trip details?

USER: My return date is on 08/30 from ATL.

ASSISTANT: Thank you for your information.

USER: Ok.

ASSISTANT: No flight is moving to your region when I search in our data base.

USER: Thank you for the information.

ASSISTANT: Welcome.