You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to change my existing reservation due to postpone of my conference. Could you please help me?

ASSISTANT: Sure, may I know your name for change process?

USER: I am Margaret Young.

ASSISTANT: Your change reservation found. Can you provide the new airport codes please.

USER: Sure, my travelling dates are May 3 and May 5. My airport codes are JFK and IAH.

ASSISTANT: Ok, do you have any another specifications?

USER: No, I do not have any other specifications.

ASSISTANT: American Airlines providing a flight with the price 100 with 2 connection. Can I proceed for the booking.

USER: You can proceed with booking.

ASSISTANT: Your flight ticket reservation done with the flight number 1025.

USER: Thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.