Car power steering is hard in the morning?

I have Honda civic 1999 in good condition. When I start the car in the morning drive the power steering is very very hard needs too much force to turn my car. But after a drive of one hour to my office it becomes normal when it gets hot. I have checked the power steering fluid and belt both are good. What could be the reason; a bad pump or anything else? Kindly share
Added (1). please update

Read more: Car power steering is hard in the morning?