Hello.
Hello. How may I help you?
Due to change in my plan to visit Dallas, I would like to change my existing reservation.
Sure, please wait for a minute to check. May I know your name?
My previous reservation has done with the name of Gary Allen.
No reservation found on your name. Sorry for inconvenience.
Ok, may be my brother has already changed my reservation on behalf of me.
Ok.
Thank you for providing information.
You are welcome.