user: Question: When was the Partido Radical party in Madrid registered?
Columns: ['Party', 'Name in English', 'City', 'Province', 'Date of registration']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Partido Obrero y Campesino', 'Workers and Peasants Party', 'Madrid', 'Madrid', '1979-01-02']
SQL:

assistant: SELECT "Date of registration" FROM "Table" WHERE "Province" = 'Madrid' AND "Party" = 'Partido Radical';