For those of us with memories like a sieve, this is a bit challenging. But when you do remember facts about a person, try to mention those in conversation. Make references to them. Ask questions about those pieces of their lives which they shared with you.
It can be as simple as asking about their pets, their crazy aunt, or their recent adventure.
It doesn’t take much to make people feel important and that’s a critical need which we can all fill for someone. So don’t forget those details!