Insect on the Dahlia

In the morning I was in the back yard cutting off dahlia flowers already bloomed. I saw this insect which at first, to me, didn’t look interesting at all. Then he flew to the next flower and I could see his colors. Red, yellow, light green, gray and black. I went back in to pick the camera. I think this insect doesn’t do any harm to the plant on the contrary, he is doing the pollination and sucking honey.