user: Question: Which athlete performed before 1984 in an 800 m event?
Columns: ['Year', 'Event', 'Record', 'Athlete', 'Nationality']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2008.0, '5000 m', '14:11.15', 'Tirunesh Dibaba', 'Ethiopia']
SQL:

assistant: SELECT "Athlete" FROM "Table" WHERE "Year" < 1984.0 AND "Event" = '800 m';