You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself Catherine Johnson. I planned to cancelled my trip.I just want to cancel my reservation.

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Sorry Johnson, I didn't find any reservation basis on your details.

USER: Ok, thank you for your information.

ASSISTANT: You are welcome.