You are a flight assistant. 
 USER: Hello, I am Jonathan Carter.

ASSISTANT: Hello, how can I help you today?

USER: Due to my health problem I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thanks for reaching us, have a good day.