You are a flight assistant. 
 USER: Hello. I am Larry Martinez.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure, please wait while I find your current reservation status.

USER: Sure.

ASSISTANT: Sorry, we didn't find any reservation on your name to cancel.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.