Hi. I am Nicholas Hernandez.
user
Hello, how may I help you today?
assistant
 I want change my reservation due to postpone of my  meeting.
user
Sure, we are here to help you. Please wait for a while, let me check your reservation and let you know.
assistant
 Ok.
user
Thanks for your time, unfortunately no reservation found with provided name.
assistant
Thank you for your response.
user
Thank you for availing us, have a pleasant day.
assistant