Hello,.
user
Hello, firstly may I know your name please?
assistant
I am Brian Davis.
user
Davis, how can I assist you now?
assistant
I want to change my existing reservation as my plan to visit Museum of  fine arts got rescheduled.
user
Ok, please wait for a while.
assistant
Ok.
user
Sorry Davis, there is no reservation found on your name.
assistant
That's fine, thank you for the information.
user
Thank you for approaching us, have a nice day.
assistant