You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER:  I am Michelle Parker. I want to visit DC-IAD to attend my brother wedding. Can you book a direct flight?

ASSISTANT: Ok, please mention your planned trip dates.

USER: My trip dates are 12/09 and 12/11.

ASSISTANT: Ok, let me know your source airport.

USER: I will depart from MI-DTW.

ASSISTANT: Ok, we found a direct flight in Hawaiian airline with flight number 1017 and the price is 200. Shall I proceed?

USER: Ok, you can proceed.

ASSISTANT: Your booking is done.

USER:  Thank you for booking.

ASSISTANT: Thank you for  choosing us.