You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how can I assist you?

USER: I want to cancel my reservation as my wife's health is not well.

ASSISTANT: May I know your name for checking your ticket to cancel?

USER: I'm David Adams.

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

USER: Thanks for checking.

ASSISTANT: Thank you for reaching us.