No, if by roller you mean a separate piece of equipment that has just a large, heavy roller on it. This type of roller is meant only for use on existing turf where some of it may have lifted due to heavy frost in winter, and the roller on the back of a cylinder mower will do that job anyway. There is no other useful purpose a roller will serve on the average home lawn - it should never be used to flatten out bumps in the lawn.

With a newly laid lawn, if the preparation has been done properly, and the turf laid correctly, it should already be flat and in contact with the soil beneath. If its not, or you've got hollows or lumpy, higher parts, peel back the turf and correct those now, before the turf roots into the soil beneath.