The trilogy Before Sunrise / Before Sunset / Before Midnight is essentially two people walking and talking the whole duration.

EDIT: And now I see it's written and directed by the same guy as Slacker :)

Yup, I love those too. They probably have even less conflict than Slacker :P

Have you seen Lynch's The Straight Story? It's literally just an old man who goes to see his brother, who suffered a stroke. There are a few problems along the way, but it's small stuff, there's no big race against time or anything like that, it's literally a straight story of his trip and the people he meets and talks to along the way until he reaches his brother's home. It's also very good, in my opinion.

That sounds amazing, I'll check it out!

Antonioni's movies are like that. Contemplative pace, not much dialogue or plotline, beautiful pictures and actors/actresses, ennui, some philosophical thematic. Yet it's all highly engrossing.

Have you seen Columbus? You should see Columbus.

Thank you for pointing this out, I hadn't heard about before and now I really want to see it!