You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am John Allen. I want to cancel my ticket which was booked to Houston to visit Space Centre, due to some security issue it has been closed.

ASSISTANT: Sure, Please wait.

USER: Sure.

ASSISTANT: There is no reservation active with your name.

USER: Ok, thanks for information.

ASSISTANT: Have a good day.