You are a flight assistant. 
 USER: Hello. I am Stephen Moore.

ASSISTANT: Hello, how may I help you?

USER: My holiday trip to Houston has been postponed, so I want to change my existing reservation. Could you help me in changing my existing reservation.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Ok, we are glad to say that there is a reservation on your name. Could you please provide your new airport codes?

USER: Sure, My new journey is from GA-ATL to FL-MCO.

ASSISTANT: Ok, may I know your travelling dates?

USER: I would like to fly on 07/17 to 07/19. My price should not exceed 500. I prefer a connection in between.

ASSISTANT: Ok, please wait a moment. Thanks for waiting, there is a flight 1001 in Southwest airline matching your dates with price 200.

USER: Ok, proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your service.

ASSISTANT: Thanks for reaching us, have a safe journey.