user: Question: When did Collingwood play an away game?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '15.15 (105)', 'St Kilda', '13.3 (81)', 'Glenferrie Oval', 5000.0, '21 July 1945']
SQL:

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