Hi.
user
Hello, how can I serve you?
assistant
I want to change my existing reservation due to my conference has been postponed.
user
Sure, May I know your name please?
assistant
 I am Samantha King.
user
Please wait a minute, I will check the existing reservation to change it.
assistant
Ok.
user
Thank you for waiting, We found no reservation with your specified name.
assistant
Ok, no issue. Thanks for your response.
user
Thank you for choosing us, Have a nice day.
assistant