You can always catch up with friends you haven’t talked to in a while. Maybe ask them how they are for starters, then you guys will gradually get into a conversation. But if you want the conversation to keep going, never reply with short response like, “Oh,” or, “Nice.” This will create a harder way for the other person to respond to you, unless they ask you a question, and will create an awkwardness between you guys. Hope this helps! <33