You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My client meeting got postponed, so I want to change my reservation.

ASSISTANT: Sure, can I know your name please?

USER: My name is Alexander Hall.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.