You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Ronald Young want to change my reservation due to postpone of my exams.

ASSISTANT: Sure, we will help you. Can I have your name please? Ok fine, give me a moment to check your details. Ronald Young, there is no reservation found under your name to change.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.