Just avoid behavior that is associated with predatory types. Imagine a spectrum with one extreme being “I couldn’t care less” and the other being “I’m going to chase you”. Choose the center. Civil and slightly friendly but not let’s-be-friends friendly. Like a coworker you don’t know and who works in a different department but you see each other sometimes. Be friendly enough to not make things awkward if you meet again. The rest is up to the woman.