You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I want to change my reservation due to postponed of my Client meeting, so please help me in changing.

ASSISTANT: Sure, for changing your existing reservation we need name. Please provide it.

USER: Sure, my name is Carolyn Wright.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: That's Ok, thank you.

ASSISTANT: Thank you for reaching us.