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In December 1977 he was appointed as a coach at Port Vale by manager Dennis Butler , being demoted to reserve coach in October 1978 by new boss Alan Bloor .
 organization: Port Vale; person: Dennis Butler; person: Alan Bloor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 organization: Port Vale; person: Dennis Butler; person: Alan Bloor