Conversations that go stale

-I'm usually quite good starting conversations and keeping them alive with interesting people
-With some people though, the talk is hard to keep up, maybe they're bad at it, or uninterested?
-Fortunately such conversations often go away state without either of the parties putting effort
-Don't have to officially end the conversation, phew
-Would like to have a spark kindle a wildfire of emotions all-consuming, but the slow burn is fine
-Some people are so bad at texting or over phone, though perfect to talk in real life