(using my college dorm knowledge) just make an effort to be friendly with them. you don’t have to go out of your way to try and woo them though. just a smile or wave with “how are you doing?” or “what are you up to today?” when you’re in the same room, offer snacks/leftovers you don’t want, etc. if they accept you, cool! if they don’t, sad, but at least you’ll have a good roommate relationship!