You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be there for you?

USER: Actually my Tennis competition is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Charles Lewis.

ASSISTANT: Ok, let me check the data base and get back to you.

USER: Sure.

ASSISTANT: We found a reservation on your name. Can you share your trip dates?

USER: I would like to travel on 12/29 to return on 12/31.

ASSISTANT: May I know your source and destination airport codes?

USER: My source point is MCO to ATL.

ASSISTANT: How many connections do you need?

USER: I am comfortable with connecting flight.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: American airline is providing a flight 1012 on your way with 1 connection and fare 100. Is that fine?

USER: Ok, proceed for booking.

ASSISTANT: Your request for change has been processed successfully.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.