You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I will aid you with that. Can you please mention your preferable travel dates?

USER: My travelling dates are Dec 20 and Dec 22.

ASSISTANT: May I know your preferable airport code names for further process?

USER: My airport codes are DCA and PHX.

ASSISTANT: May I know your name for further process?

USER: My name is Christopher Smith.

ASSISTANT: Is there any additional preferences do you have?

USER: I want to travel in economy class flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I need single connecting flight.

ASSISTANT: Sure. Southwest airline flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight?

USER: Please proceed.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1007.

USER: Thanks for helping me.

ASSISTANT: You are welcome Christopher Smith.