user: Question: what is the nationality when the ship is Willerby?
Columns: ['Date', 'Ship', 'Type', 'Nationality', 'Tonnage GRT', 'Fate']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['5.12.1914', 'Charcas', 'Freighter', 'British', 5067.0, 'Sunk']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Ship" = 'Willerby';