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: June-August 2014 - FERC seeks data on Houston Ship Channel and other gas sales from several companies, including units of McGraw Hill, IntercontinentalExchange, BP, Energy Transfer (Stuttgart: 4ETA.SG - news ) Partners (Other OTC: PGPHF - news ) , Enbridge (Toronto: ENB.TO - news ) , Enterprise Products, Kinder Morgan (NYSE: KMI - news ) , Atmos Energy, Castleton Commodities, Tenaska, Integrys, Encana, Exelon, Chesapeake Energy (Other OTC: CHKDJ - news ) , Chevron (Swiss: CVX.SW - news ) , Enable Energy, Barclays (LSE: BARC.L - news ) and Total (Swiss: FP.SW - news ) .
user
headquarters_location: Kinder Morgan, Houston
assistant