What are some good recommendations, suggestions, techniques or tactics you might have regarding flakes?

Quick scenario, I'm getting IOI’s from this girl and I know she’s into me just by her vibe. She agreed to meet up with me, but cancels last minute? I don’t understand why she would agree and then just decide not to go?

Flaking is a sticking point I'm currently working on; I just can’t get a girl to be committed to meeting up and being serious about the date. What can I do for her to show up and not cancel?

Please give me your best advice, I’d really appreciate it, thanks!