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Air India  spokesman K. Swaminathan told AFP in  Mumbai  that some flights were delayed or cancelled on Thursday without specifying numbers but added : We are trying to get back to normalcy .
 city of headquarters: Air India, Mumbai
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 city of headquarters: Air India, Mumbai