You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Christopher Turner, can you help me to book a flight from DFW with 500 price limit?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are 12/30 and 01/01.

ASSISTANT: Ok, may I know your destination code to proceed further?

USER: My destination airport code is LGA.

ASSISTANT: Ok, please wait a moment I will check for the best service on your route.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, I found a flight 1004 in Delta airline matching your dates with price 200. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a nice day.