You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Robert Walker here.

ASSISTANT: Robert, how may I aid you?

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

ASSISTANT: Sure, I can help you. Please provide your airport codes.

USER: My airport codes are from DFW to PHX.

ASSISTANT: May I know your itinerary dates?

USER: My travelling dates are from 08/27 to 08/29. Make sure my price limit is 200.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok, I will wait.

ASSISTANT: UA airlines with flight 1012 is providing service with 1 connection and ticket costs you 200.

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket is reserved.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.