First Date Impressions
A recent Ohio State University study has confirmed what many of us single folks already know: that first impressions count more. Among other things, the research found that when someone betrays another early on in their interaction, it is more challenging to overcome than if the same thing occurred later on.
Those participating in the study were asked to play a game with another person (unknowingly to them, a computer program), deciding whether or not to cooperate or compete early on in the interaction. Those subjects who were competed against in the first two rounds of the game were more angry and found their 'partner' less trustworthy, as opposed to the subjects whose competition occurred later on. As well, the unhappy folks were more likely to fight with their computer generated counterparts in the last ten rounds of the game.
But how does this information translate to the dating world? Simple. If you have to cancel at the last minute with someone you're either just meeting or have only interacted with once or twice, know that you're facing an uphill battle. In fact, any transgressions during those first few crucial meetings will be more harshly judged than if they took place several months down the road.
Related: First Date Tips
Source: Huston, Matthew. "Best Face Forward." Psychology Today April 2009 Vol 42, No 2:32.

A great way to prevent a woman from canceling a date is to pre-emptively tell her that you don’t like girls who “flake” on plans. Ask her is she’s “flaky”. She’ll say “no” and she’ll be less likely to cancel due to the principle of commitment and consistency.
David Gideon
I like David’s answer. But yes, I think everyone knows that first impressions mean absolutely everything and not just with relationships.
david gideon, if you tell a girl that u hate girls that a “flaky”…she will assume uve had experience being flaked on. Statistics may show that it is less likely for her to cancel due to commitment,but good luck on the second date. Try other ways to find her to commit, like telling her uve moved a meeting to make time to hang out.
Hhhm…Telling her like that may make her think that she is an important person to him so you will get an advance points from her. Your advice Style sounds effective because as we all know ladies really want an attention. You have a nice style Style.