You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: I am Andrew Lee, would like to change an existing reservation because of my movie shoot was postponed. Will you check with reservation to change?

ASSISTANT: Sure. Please wait for a  while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, Thanks for the quick response.

ASSISTANT: Thank you.