Hello.
Hello, how can I help you today?
I need to change my existing reservation as I plan to go for a holiday trip got postponed. Can you please help me with this?
Sure, can I have your name please?
My name is Betty Lewis.
Ok, please wait for a while.
Sure, make it fast.
Thanks for waiting, there is no active reservation on your given name.
Not  a problem, thanks for checking.
Thank you for opting us.