You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Donna Brown, want to alter my recent reservation due to some personal problem. Please help me out with that.

ASSISTANT: Sure, we are perky to help you.

USER: Thank you.

ASSISTANT: Please hold for a moment.

USER: Sure.

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

USER: It's ok, thank you.

ASSISTANT: Thank you for availing us.