Hello, I am Jonathan Miller.
user
Hello, how can I serve 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. Can you please help me out in changing my reservation?
user
Sure, I am happy to help you. Please wait for a moment.
assistant
OK.
user
Sorry to inform you that there is no reservation found on your name.
assistant
OK, no issue.
user
Thanks for choosing us and have a good day.
assistant
Thank you for the information.
user