You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what kind of help get from me?

USER: I am David Hall, I need to cancel my recent reservation due to an health issue. Can you help me?

ASSISTANT: Sure, we are kindly help you with this cancellation.

USER: OK.

ASSISTANT: Sorry for the delay, no reservation found with the given name.

USER: Sure. Thank you for your help.

ASSISTANT: Thank you for opting us.