Hello.
Hello, how may I aid you today?
I want to change an existing reservation, so please help me in changing the reservation.
Sure, I am here to help you out. Please provide me your name to check the reservation status.
Myself Helen Carter.
Please allow me a moment.
Ok.
Sorry  Helen Carter, there is no reservation on your name in our database.
Not an issue. Thank you.
Thank you for reaching us.