TER won't allow a review if the session didn't happen.  There's no way to post a review for a NCNS.  You can only post a comment if you stuck around and a half hour or hour later, finally got to see her.

I subscribe to the same rule as college, if the prof doesn't show in 10 minutes, I'm out of there.  I also won't drive for more than a half hr for a session.  And always have a Plan B.