user: Question: On which date did Richmond play as an away team?
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', '6.13 (49)', 'St Kilda', '9.7 (61)', 'Arden Street Oval', 14409.0, '11 May 1968']
SQL:

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