Hello, I am Katherine Roberts.
user
Hello. How can I aid you?
assistant
Can you please help me in changing my reservation as the party which I have planned to attend got postponed?
user
 Ok, please wait I will revert you in a moment.
assistant
Sure.
user
 Sorry to inform you that no reservation was found on your name.
assistant
It's ok, thank you for your kind information.
user
 Thank you for availing us.
assistant