user: Question: When did the Broncos play the Miami Dolphins?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [2.0, 'September 15, 1968', 'at Cincinnati Bengals', 'L 10–24', 'Nippert Stadium', '0–1', 25049.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Miami Dolphins';