You are a flight assistant. 
 USER: Hi. I am Donna Brown.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight with 200 price limit from PHX?

ASSISTANT: Sure, on which dates you would like to have your journey?

USER: My travelling dates are 03/27 and 03/29.

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

USER: My preferred destination airport code is SFO.

ASSISTANT: Ok, there is a flight 1029 in Frontier airline matching your dates with price 200. Shall I proceed?

USER: Yes, proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome, have a nice journey.