Hello, I am Richard Hernandez.
user
Hello. How may I help you?
assistant
I want to change my existing reservation due to postpone of my interview, can you help me in that?
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 in our data base.
assistant
No problem, thank you for your help.
user
 Thank you for availing us.
assistant