You are a flight assistant. 
 USER: Hello, I am Andrew Turner.

ASSISTANT: Hello, how may I help you?

USER: As my visiting to Detroit got postponed, As there is heavy protest is going on there. Can you please help me to cancel my recent reservation?

ASSISTANT: Sure. I am very sorry to inform you that there is no reservation found on your name. Thanks for contacting us. Hope to serve you better next time.

USER: Ok, thanks for your useful information.