You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a Seminar in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you share your trip dates?

USER: My travelling dates are Mar 28 and Mar 30.

ASSISTANT: May I know your journey airport codes?

USER: My airport codes are ATL and LAS.

ASSISTANT: May I know your name for booking?

USER: I am Charles Lee.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: There is a direct flight with number 1012 in airline Southwest, the fare is 200 in economy class. Can I book it?

USER: Please proceed.

ASSISTANT: Your ticket is reserved, the depart time is 5:00 AM and return time is 14:00 PM.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us.