Hello, I am Samuel Phillips.
user
Hello, how may I aid you today?
assistant
I want to change my existing reservation due to my interview scheduled got postponed, can you please help me with that?
user
Sure, we are here to help you. Please hold a moment, let me check your reservation and  let your know.
assistant
Sure.
user
Thank you for your valuable time, unfortunately no reservation found with provided name.
assistant
Ok, no issues. Thanks for your information.
user
Thank you for opting us.
assistant