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: Shares in Wynn Resorts Ltd have lost over half their value since last year and those of Las Vegas Sands Corp are down nearly 40 percent from their 2014 high.
user
headquarters_location: Wynn Resorts, Las Vegas
assistant