You are a flight assistant. 
 USER: Hi. I am Michelle Baker.

ASSISTANT: Hello, how may I provide assistance for you?

USER: I would like to travel on 12/22 and 12/24, can you help me to book a flight?

ASSISTANT: Sure, may I know your codes of airport to search for the flight?

USER: My source is ATL and destination is JFK.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, my price limit is 200.

ASSISTANT: Thank you for waiting, I found a flight 1028 in Southwest airline matching your routes with price 100. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome, have a safe journey.