As I passionately described the restaurant, the menu, and the ambiance, they listened politely. They thanked me for the information and left. At that point, I assumed that they weren't that interested in my restaurant recommendation or my artwork.
So, imagine my surprise on Sunday when they came back to tell me what a fabulous experience they had. Not only did I gain a new customer for my favorite restaurant, but I also gained a new customer for myself. They ended up buying one of my pieces.
So, keep planting seeds. You never know when or where they're going to sprout.