This question came to me on a specific case, but I realized its a general answer I'd like to have. Remember the lesson, not the mistake.

So lets say you've seen a girl a couple of t imes, fucked, the whole thing. Then she goes radio silent, you engage and ask her if she wants to do something on saturday. But she replies she already has plans AND doesn't follow up with "how about x day?"

Do you just stop answering? Do you go "oh, okay, no problem" before you vanish? What's the move?

I'd say immediately soft next her. But I've also read here to not even bother replying, but IMO that comes off a bit butthurt. Thoughts?