New Light Fixture - wiring does not match

We removed a light fixture in the dining room that was installed when we built the house in October 2001. However; we failed to take a picture of the connections. The wires from the ceiling are 2 white, 2 black, 1 red, and copper. The new light fixture has 2 black and a copper. The light switch is three switches – one to an outdoor outlet, one to an outdoor light, and one to the light over the dining room table which has a dimmer. Unsure how to connect the new fixture wires to the existing wires.