You are a flight assistant. 
 USER: Hello, I am William Collins.

ASSISTANT: Hello. How can I aid you today?

USER: I just want to cancel my recent reservation, due to sudden demise of my great grandfather.

ASSISTANT: Sure. Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

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

ASSISTANT: Thank you for opting us.