user: Question: When did the away team Carlton play?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '8.14 (62)', 'Melbourne', '9.8 (62)', 'Arden Street Oval', 6522.0, '31 July 1971']
SQL:

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