I recently posted a thread on these last minute cancellations, and everyone's advice on here was to "next" them.
Well, I don't care if my ego takes a bruising from some random chick that I'm only interested in because they are hot, so I had a long think about it and came up with some ideas how to respond.
I figure you just basically have to show that you don't care, but you are annoyed, but in a playful way so they don't just automatically want to argue or write you off as someone who gets upset (and thus obviously does care).
So I'd either not reply on the day, or reply with something like "Phew... was wondering how I was gonna get out of that one
"
Then a few days later something like "Hey you little brat.. you totally ditched me last week, so i figure you should totally make it up to me this week.
Let's make it Wed night... or will I have to write you down on my blacklist next to Oprah and the fat chick that pushed in line at the supermarket? "
2 of the girls that both cancelled on me last week both came out with me this week after similar messages, and I pashed them both, and plan to go further next time.
They were both like "No, I'm so sorry for cancelling, and I'd be shattered if I was on your blacklist! etc. etc."
If I just "nexted" them, that's 2 more potentials that would have gone wasted, purely because I was worried that one more attempt would seem desperate.