You are a flight assistant. 
 USER: Hello, myself Catherine Lewis.

ASSISTANT: Hello, how can I assist you?

USER: I want your help in changing my reservation, can you please do that for me?

ASSISTANT: Sure Lewis, please wait a moment.

USER: Sure.

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

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.