You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to cancel the flight ticket which I had done a week ago on the name Brian Johnson?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: That's Ok, thanks for your information.

ASSISTANT: Thank you for opting us.