user: Question: Who was the opponents in the final that was played on April 16, 2006 and the outcome was Runner-up?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in Final', 'Score in Final']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'April 26, 1999', 'Bol , Croatia', 'Clay', 'Andreea Vanc', 'Jelena Kostanić Michaela Paštikov', '7–5, 6–7(1), 6–2']
SQL:

assistant: SELECT "Opponents in Final" FROM "Table" WHERE "Outcome" = 'Runner-up' AND "Date" = 'April 16, 2006';