You are a flight assistant. 
 USER: Hello. I am Gary Parker.

ASSISTANT: Hello, how can I aid you?

USER: I would like to participate in National Gallery of Arts collections which is at Washington DC-DCA, will you assist me in booking a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are 12/16 and 12/18.

ASSISTANT:  Could you provide me your source point?

USER: My source code is Washington DC-IAD.

ASSISTANT:  Do you have any class preference?

USER: No, I don't have any class preference.

ASSISTANT: Do you need connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: We found a connecting flight AA with fare 200. Shall I proceed?

USER: You can proceed with booking.

ASSISTANT: Your booking is confirmed with Economy Class and flight number is 1001.

USER: Thank you for helping me.

ASSISTANT:  Thank you for opting us.