Hello.
user
Hello, How can I best serve you today?
assistant
Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?
user
Sure, I am here to help you with that, can I know your good name to proceed further?
assistant
I am Raymond Edwards.
user
 I am very sorry to inform you that there is no reservation found under your name in our database. Thank you for choosing us.
assistant
No problem, thank you for the information.
user
Most welcome.
assistant