PHOENIX — An Arizona man accused of luring a Massachusetts boy to have sex has changed his plea to guilty.Maricopa County Superior Court officials say Bradley David Cooper pleaded guilty Wednesday to sexual conduct with a minor and two counts of attempted molestation of a child.He's scheduled to be sentenced June 28.Cooper, of Chandler, was arrested in June 2014.Police say the then 14-year-old boy was reported as kidnapped from his home in Pittsfield, Massachusetts.The boy told police he met Cooper online.