Hello, I am Raymond Brown.
user
Hello, how can I amend you?
assistant
Change     Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me with it?
user
 Ok, please wait I will check and revert you.
assistant
OK.
user
 Sorry, no reservation was found on your name.
assistant
No problem, thank you.
user
 Thank you for opting us.
assistant