Hello.
user
Hello, how can I help 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
Can I know your name?
assistant
I am Robert Turner.
user
 Sorry, there is no reservation by your name.
assistant
Ok, no issues. Thanks for the information.
user
Thank you for choosing us.
assistant