You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to change my reservation due to postpone of my exams?

ASSISTANT: Sure, may I know your name?

USER: I am Raymond Moore.

ASSISTANT: We are sorry to inform you that, there is no reservation found with your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for information.