user: Question: Which Partner has a Date of June 18, 1989?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in Final', 'Score in Final']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'June 18, 1989', 'Birmingham , England', 'Grass', 'Pam Shriver', 'Larisa Savchenko Natalia Zvereva', '5–7, 7–5, 0–6']
SQL:

assistant: SELECT "Partner" FROM "Table" WHERE "Date" = 'June 18, 1989';