Daytime silver, very bright object followed by dull grey then another bright star super bright silver

Employee of Facility. Was walking to a housing unit. There was a staff member holding the door for me, she says "hey what you think that is?" I turned around and looked up and observed a very bright shinny silver ball. Looked high up and was hovering but changing altitude. Would go high then lower. Then vanished after a minute or so. I was shocked. I kept looking up and observed a dark gray almost moon grey moving very high altitude but traveling across the sky quickly. I observed that for 20 seconds or so. I looked at the staff member I was with and said are you seeing this, she said oh my God yes. I looked back up and again observed a bright shinny object but it had shifted to another part of the sky and appeared to float up and down. For a couple minutes.