You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Jennifer Scott. I want to change my existing reservation due to postpone of my event. Could you please help me>.

ASSISTANT: Sure, let me check the current status and revert you.

USER: Sure.

ASSISTANT: There is no reservation found by the name you provided.

USER: No worries, thank you for the information.