user: Question: What is Matt Allen's sail number?
Columns: ['Position', 'Sail Number', 'Yacht', 'State/Country', 'Yacht Type', 'LOA (Metres)', 'Skipper', 'Elapsed Time d:hh:mm:ss']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'M10', 'Skandia', 'VIC', 'IRC Maxi 98', '30.00', 'Grant Wharington', '2:15:14:06']
SQL:

assistant: SELECT "Sail Number" FROM "Table" WHERE "Skipper" = 'Matt Allen';