Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.
Text: General Motors Co. GM -1.07 % Chief Executive Mary Barra said earlier this week she sees no need to follow Ford’s move because she is confident the company can profitably build its small cars in the U.S. GM builds its Chevy Sonic subcompact and Cruze compact in the Midwest.
user
employer: Mary Barra, General Motors
assistant