most of the time to prevent flaking you have to either get her more attracted to you in the initial point or get her to invest in you more by making her work for you more. because think about it if you work really really hard to get a girl even if shes only an HB7 your most likely gonna say yes if she asks you out just because otherwise it was a waste of your time.
there are a couple tips and tricks that sometimes might work to lessen flaking. for example when you ask a girl out if you think she will flake make it casual by saying something like "hey me and my friends are headin to the park wanna tag along?" this way she doesnt feel as pressured and its not much of a more "formal" date.
try this link it helps you understand flaking a little bit its a little video just type in your email address.
http://www.attractwomen.com/alpha-sexua ... m-squeeze/