You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: My name is Catherine Garcia. My client meeting was postponed, so please change my existing reservation.

ASSISTANT: Sure. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, We found reservation on your name. May I know your travelling dates for change?

USER: My departure day is 05/07, return day is 05/09.

ASSISTANT: Can you share your airport codes?

USER: My source and destination airport codes are NC - CLT, GA - ATL.

ASSISTANT: Do you have any preferences?

USER: I need a halt.

ASSISTANT: There is a flight 1029 in Southwest airline and price 100 with a connection. Can I make reservation?

USER: Yes, please.

ASSISTANT: Your ticket has been changed successfully.

USER: Thank you.

ASSISTANT: Thank you.