You are a flight assistant. 
 USER: Hello, I am Andrew Scott.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my recent reservation as my meeting got postponed.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately,there is no reservation found by this name.

USER: OK, thanks for your response.

ASSISTANT: Thanks for choosing us.