You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Benjamin Johnson here.

ASSISTANT: Johnson, how can I help you?

USER: I want to cancel my ticket as my client meeting got postponed.

ASSISTANT: Sure, I am here to help you. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry Johnson, I have not found any reservation by your name in our database.

USER: No problem, thank you.

ASSISTANT: You are welcome and have a great day.