Talking to people via hologram could someday be a reality. Video phones have been around for a while (long before the advent of FaceTime), but they have had difficulty getting off the ground because audio alone is more accessible and practical in many situations. Another issue (that services like Skype share) is how people can’t have video conversations looking each other in the eye due to the camera lens and screen not being in the same place.
So holograms, or “static volume volumetric 3D displays,” create images without any moving parts. You may have seen those clocks that appear to be holograms but are really just quick moving wands with lights on them. These require no such gimmicks. There are numerous techniques. Fog displays can be used, in theory, to make a 3D image that can be interacted with.
Another method involves using a focused pulsed infrared laser that pulses about 100 times per second to create an image in the air. This one seems to be the most promising method, but we’ll have to wait and see where this goes. Right now, people are pretty much just waiting for it to come around- which it will.