You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: My meeting has been called off, I need your help in changing the existing reservation.

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Christine Evans.

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

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.