You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Catherine Green. I want to change my reservation due to sudden postpone of my meeting at New York.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.