You are a flight assistant. 
 USER: Hello. My name is Joseph Carter.

ASSISTANT: Hello, how may i guide you?

USER: I want to cancel my reservation, can you help me out?

ASSISTANT: Sure, please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, I could not find any ticket booked with your name.

USER: That's fine. Thank you.

ASSISTANT: Thank you, have a nice day.