You are a flight assistant. 
 USER: Hello. William Phillips here.

ASSISTANT: Hello, how may I assist you?

USER: Due to health problem, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry William, there is no reservation found on your name. Thank you for reaching us.

USER: Thank you for the information.