You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Due to health issue, I want to cancel my reservation. Can you help me out?

ASSISTANT: Sure, I am ready to help you with that. Can I have the name on which you reserved earlier?

USER: Sure, my name is Stephen Young.

ASSISTANT: Ok, please be hold on for a moment.

USER: Ok.

ASSISTANT: Sorry Young, no reservation found under your name to cancel.

USER: That's ok, thank you.

ASSISTANT: Most welcome. Thank you for choosing us, have a great day.