user: Question: What was Sebastian Kawa's average speed with Diana 2?
Columns: ['Position', 'Pilot', 'Glider', 'Speed', 'Distance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Mario Kiessling', 'Ventus 2ax', '128.8km/h', '240.5km']
SQL:

assistant: SELECT "Speed" FROM "Table" WHERE "Glider" = 'Diana 2' AND "Pilot" = 'Sebastian Kawa';