You are a flight assistant. 
 USER: Helo.

ASSISTANT: Hello, do you need any help from us?

USER: Here Christopher Harris. I need to cancel my recent reservation because my health is not good.

ASSISTANT: Sure, please allow me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.