You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I am Michael Carter. I want to change my reservation due to my interview got postponed.

ASSISTANT: Sure, I will help you to change your reservation. Please wait for a moment, while I check for the reservation on your name.

USER: Ok.

ASSISTANT: Thanks for the waiting, sorry to inform that there is no any reservation is found on your name in our system data.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for visiting us, we hope see you again.