The term “Friendship” – How generalized can it get?

It’s quarter past three in the afternoon. I am sitting at a crowded café sipping at my coffee. I don’t like it black so I add in a little cream with latte. There is one empty seat at the other end of my table. A guy, not so old, comes close to me and says, “Buddy, can I share this seat? I need to rest my feet.” “You can”, I said. “It’s not occupied.” The moment he sat, he thanked me and introduced himself to me.