You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Mary Wilson, I am planning to travel from Detroit, DTW to Denver, DEN. Could you make a reservation?

ASSISTANT: Sure, can I know when you want to travel?

USER: I want to travel on 05/21 and 05/23.

ASSISTANT: Ok, do you need any halt in between your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. We found a direct flight with class economy and airline Hawaiian at a price of 100. Shall I proceed?

USER: You can proceed.

ASSISTANT: Sure, your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.