You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Deborah Collins. I would like to cancel my existing reservation because my brother marriage was postponed, can you help me?

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found under your name to cancel it.

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

ASSISTANT: Welcome Deborah Collins.