user: Question: What is the date of the final that has a score of 3–6, 6–3, 6–4 and Penny Barg Paula Smith was the opponent?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score in the final']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runners-up', 'April 29, 1985', 'Houston , USA WTA Virginia Slims', 'Clay', 'Helena Suková', 'Elise Burgin Martina Navratilova', '1–6, 6–3, 3–6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Score in the final" = '3–6, 6–3, 6–4' AND "Opponents in the final" = 'Penny Barg Paula Smith';