user: Question: What was the airing date when the number of episodes was larger than 20 and had the genre of Costume action?
Columns: ['Airing date', 'Number of episodes', 'HD format', 'Highest average point ratings', 'Genre', 'Official website']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['1 Jan- 27 Jan', 20.0, 'Yes', 37.0, 'Modern comedy', 'Official website']
SQL:

assistant: SELECT "Airing date" FROM "Table" WHERE "Number of episodes" > 20.0 AND "Genre" = 'Costume action';