Hi. I am William Roberts.
user
Hello, how may I help you?
assistant
I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation,. Please help me.
user
Sure, please  give me  minute.
assistant
Ok.
user
There is no reservation found with your name.
assistant
Fine, thanks for the information.
user
Thanks for opting us.
assistant