Make an observation, any observation, and say something about it. You'll find that it's fun talking to randos even for just a few words. Like if you say "This line is long." And they just grunt.

And about silly things. I was at a restaurant and, as listed in the menu, they has a "boneless chicken pot pie". So I asked the waitress if I coukd have the chicken bone in. Silly things like that.

Hope that helps 🙂