user: Question: What is the series 3 with Gavin Duffy in series 5?
Columns: ['Seat', 'Series 1', 'Series 3', 'Series 4', 'Series 5']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, "Niall O'Farrell", "Niall O'Farrell", "Niall O'Farrell", 'Peter Casey (businessman)']
SQL:

assistant: SELECT "Series 3" FROM "Table" WHERE "Series 5" = 'Gavin Duffy';