user: Question: What day is North Melbourne the away side?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Footscray', '13.19 (97)', 'North Melbourne', '8.4 (52)', 'Western Oval', 22178.0, '22 April 1961']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team" = 'North Melbourne';