The comfy chairs in conference rooms should have little motors attached to the wheels and sensors. When everyone gets up to leave, the last one out hits a button near the light switch and the chairs neatly arrange themselves around the conference table ready for next time.
If a conference chair has five spokes for the legs, and therefore five wheels, one on each spoke. You would need at most two small stepper motors at opposing angles that could be used to move and rotate the chair. A simple infrared sensor mounted beneath the chair can detect an infrared beam emanating from under the conference table that is used to guide the chair in to position.
Each chair can also communicate with the conference table, either wirelessly, or through an infrared emitter to let the conference table know that the chair has docking.