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Hainan Airlines  Company Limited ( HNA ) ( ) ( ) is an airline headquartered in  Haikou  People's Republic of China .
 city of headquarters: Hainan Airlines, Haikou
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Hainan Airlines, Haikou 
Answer:
 city of headquarters: Hainan Airlines, Haikou