I usually plan a dive with a buddy, but have hooked up with other solo divers. I have run the gamet of the ones who once we descend they are gone and you keep up with them and there are others who communicate all the time even under water. Talk and listen to them. If they communicate on top the water they will most likely communicate underwater. If they say ok I am going to do this . . . without regard to what you want out of the dive then stick close to them as they won’t stick close to you.