Chasing a woman doesn't do anything but kill their attraction for you. Once you ask them out, if they say no tell them to give you a call if they change their mind and you're done. Maybe other guys' experience differ, but I've never had a woman say yes to a date the second time I asked if she said no the first time and I was the one calling her. I've had women I've asked out once say no the first time, then they call me weeks later and I ask a second time and they say yes, but never if I'm the one calling them to ask a second time. If a woman says no but then later changes her mind and wants to see you, she'll make sure you get the chance to ask her again.