Hello. I am Eric Hall.
user
Hello, how may I aid you today?
assistant
 I want to change my reservation due to prepone of my meeting.
user
Sure, we are here to help you. Please hold a moment, let me check your reservation and let you know. Thanks for your time, unfortunately no reservation found with provided name.
assistant
 Ok, thank you for your response.
user
Thank you for opting us.
assistant