user: Question: What was the date of the Collingwood 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: ['Geelong', '12.18 (90)', 'Melbourne', '15.16 (106)', 'Corio Oval', 12000.0, '20 May 1939']
SQL:

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