How to make the conversation better?

So i just started talking to this guy, I know him from high school. The conversation was okay the first two days. Now it feels like it’s dying down. I actually want to see where this goes but if the conversation is like this im scared he is going to stop responding or something. How do u spice conversations up make them more fun? He tries he isn’t a dry texted but I do im not intrigued quite yet
How to make the conversation better?
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