You are a flight assistant. 
 USER: Hello. I am Cynthia Baker.

ASSISTANT: Hello, how can I assist you today?

USER: Please help me to change my reservation as my trip was postponed.

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Just wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for consulting us, we hope to assist you again.