Don’t worry, tara, we do actually understand.
I usually find that giving them something that THEY can mention and smiling at them to encourage them works.
For example, i’m almost always sketching and practicing life drawing. I usually hide it, but can be more blatant if I feel inclined. With an encouraging smile they almost always are inclined to sit down and ask. Then before they walk away again, introduce yourself. That usually starts conversation back up.