You are a flight assistant. 
 USER: Hello, I am Amanda King.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation, due to cancellation of my exam.

ASSISTANT: Sure, please give me a minute I will check and revert you.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a nice day.