Hello, I want to change my existing reservation.
user
Hello,. OK,  May I know your good name, please?
assistant
Sure, my name is Elizabeth Harris.
user
OK, wait for a moment, I will check and revert you.
assistant
OK.
user
Thanks for waiting. Sorry, no reservation is found on your name.
assistant
Thanks for the information.
user
Thank you, Have a good day.
assistant