user: Question: What type has a Date of 8 Dec 16, and a Ship of Duchess of Cornwall?
Columns: ['Date', 'Ship', 'Type', 'Nationality', 'Tonnage GRT']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['2 Dec 16', 'Voltaire', 'Cargo ship', 'United Kingdom', 8618.0]
SQL:

assistant: SELECT "Type" FROM "Table" WHERE "Date" = '8 Dec 16' AND "Ship" = 'Duchess of Cornwall';