Seperate Lip sync option?

I’m doing some kind of a “News“ project using animation characters. Imagine 2 characters talking to eachother in the scene(voice acting recorded from seperate people via internet, for example, 2 people talked through skype for the voice acting). Me and my friend has their own individual characters in the scene and I’m trying to record the voice seperately(Voice recorded for Character-A from Person-A & Character-B from Person-B). Currently, I’m doing the “slow-life work” just by cutting the voices that were recorded and put them for each characters(Apparently, it‘s quite a long work)

What’s the correct, easiest, proper or fastest way to do it? If there isn’t any other way, then it’s okay. I’ll just head-on and do it with my current work style.