its really not about confirming. its how you do it.
most guys who dont understand the game will say some sh1t like:
"are we still on for tonight"
the more experienced guys will say something like:
"see you later at 8" --> notice how i'm not asking her sh1t.
"here's the address. ima leave my place at 530pm. see u soon".
what these messages are doing is, they're telling her exactly what's going to happen. if shes gon be running late or whatever, she'll text u back quick.
saying "are we still on for tonight" conveys to her you've been canceled on in the past by many girls.

I use the are we still on for tonight, if she flakes and cancels shrugs or concocts whatever in her mind
. Won't see me asking again.I stopped giving a damn what a woman thinks long ago, but I see what your saying though.
I was suppose to meet a chick at starbucks on sunday, she "was sick", I just said allright and I went anyways. Anything I plan, ima do regardles

If the guy didn't call me to confirm it, I would assume he changed his mind.
Watchin YOUR actions
, but I can't approach him.