Hello, my name is William Evans.
user
Hello, how may I help you today?
assistant
I want to change an existing reservation.
user
OK, William Evans, we are here to help you. Please wait for a couple of minutes.
assistant
OK, I will wait.
user
Thanks for your patience. Sorry, we did not find any existing reservation on your name.
assistant
That's not a problem. Thanks for your information.
user
Thanks for choosing us. Have a nice day.
assistant