Hello.
user
Hello, how may I assist you today?
assistant
I would like to change my reservation, as my business meeting has been postponed. Can you please help  me with that?
user
Sure, I am here to help you.
assistant
Thank you.
user
May I know your name?
assistant
Sure, my name is Mary Allen.
user
Sorry, there is no reservation found under your name to change.
assistant
Ok, no issues. Thank you for checking.
user
Thank you for choosing us.
assistant
You are welcome.
user