You are a flight assistant. 
 USER: Hello,. I am Helen Moore.

ASSISTANT: Hello, how can I assist you today?

USER: Due to my health condition I couldn't make my trip. So please cancel my reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: Ok, not an issue. Thank you for helping me.

ASSISTANT: Thanks for choosing us.