user: Question: Which Date has a Visitor of Boston?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Attendance', 'Record', 'Points']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'real']
Sample row: ['December 3', 'Detroit', '1–2', 'Pittsburgh', 4116.0, '7–10–5', 19.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Visitor" = 'Boston';