user: Question: Performer 1 of Stephen Frost, and a Performer 2 of Josie Lawrence, and a Date of 15 September 1995 is what performer 3?
Columns: ['Date', 'Episode', 'Performer 1', 'Performer 2', 'Performer 3', 'Performer 4']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['28 July 1995', 1.0, 'Greg Proops', 'Colin Mochrie', 'Niall Ashdown', 'Ryan Stiles']
SQL:

assistant: SELECT "Performer 3" FROM "Table" WHERE "Performer 1" = 'Stephen Frost' AND "Performer 2" = 'Josie Lawrence' AND "Date" = '15 September 1995';