user: Question: When was the home team Essendon? 
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Ground', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Fitzroy', '4.0 (24)', 'Hawthorn', '3.1 (19)', 'MCG', 'Saturday, 24 May']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Home team" = 'Essendon';