You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER: I am George Robinson, I want to book a direct flight from Detroit for round trip. Can you help me to book a flight ticket?

ASSISTANT: Sure, when are you planning to make your travel?

USER: I will fly on 02/16 and return on 02/18.

ASSISTANT: May I know your airport code?

USER: My destination and source point is MI-DTW.

ASSISTANT: Thank you for giving your details. There are no flights on your requested dates.

USER: Ok, thank for the information.

ASSISTANT: Thank you for reaching us.