I'll say this:
I have this girl I've been dealing with for probably too long. She always flakes the day before we're supposed to meet or wtvr...so I set up another for Sunday...at the exact time I had planned to meet some friends for lunch...and flaked on her.
Since then, she's called me at least once a day her flirty behavior has doubled in strength, and has text'd me every night asking if I want to go grab a beer or something before I go to work.
Not saying it will work every time, perhaps this is a special instance...but it seemed to make a bit of difference.