You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I want to change my reservation can you help me?

ASSISTANT: Sure.

USER: My name is Andrew Lewis.

ASSISTANT: Please wait a moment Andrew Lewis, I will inform you.

USER: OK.

ASSISTANT: Sorry, there is no reservation on your name Andrew Lewis.

USER: OK, thank you for checking.

ASSISTANT: Your welcome.