Being ignored in one on one conversation?

Hi there, this is a throwaway for fear this will be read by them and I'd feel terrible if this is how they found out but I'd like advice on a friend I have. We've only known each other a short while so we have plenty of getting to know each other to do, but it feels like they somehow manage to brush me off even in one on one conversation although we should have a lot to talk about. I've felt ignored in group conversations in my life but this is a new one alright. Messages with them aren't as bad, but calls/conversations feel like I'm listening to their inner monologue, and any input I make isn't EVER acknowledged let alone expanded on. I don't really know what to do or how to communicate with them without sounding like I'm nagging or mean but I cannot deal with this it's so frustrating. Any help would be appreciated.