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Also Wednesday the Department of Transportation said it tentatively awarded new daily service between  Houston  and Bogota Colombia to Houston-based  Continental Airlines  expanding existing service it already offers to Bogota from both Houston and its New York-area hub in Newark .
 city of headquarters: Houston, Continental Airlines
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:  Houston, Continental Airlines 
Answer:
 city of headquarters: Houston, Continental Airlines