Hello.
user
Hello, what service are you looking for?
assistant
I am Melissa Hill, I want to change my reservation due to prepone of my  business meeting. Can you help me?
user
Sure Melissa, please wait for a moment.
assistant
Sure.
user
I am sorry to tell you that we didn't find any reservation on your name.
assistant
Ok, thanks for informing me.
user
Thank you for checking with us.
assistant