Answer:
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
What an fill a room but takes up no space?
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has handsอพ lacks a head but has a face.
What's black when you get it, red when you use it, and white when you're all through with it?
A man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?
If itโs information you seek, come and see me. If itโs pairs of letters you need, I have consecutively three. What am I?