How to respond to the answer "I'll think about it"?

When it sounds after your "maybe we'll meet the day after tomorrow." In fact, there are a HUGE number of options - to continue the conversation on another topic, to joke ... But now I have started to follow a slightly different tactic. I just forwarded to write something after "I'll think about it." And you know, it works just magically. The girl begins to think if I offended him, if I pushed him away a lot, it turns out he doesn’t really need me ... And we need such thoughts, guys, they go to our piggy bank. Yes, if the girl did not want a meeting, she will not want her after such an ignore. But doubters can go to the bright side of seduction!