user: Question: How many conversions did Severo Koroduadua Waqanibau have when he has 0 pens?
Columns: ['Player', 'Tries', 'Conv', 'Pens', 'Drop', 'Venue', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Severo Koroduadua Waqanibau', '0', '18', '0', '0', 'Apia', '10/09/1983']
SQL:

assistant: SELECT "Conv" FROM "Table" WHERE "Pens" = '0' AND "Player" = 'Severo Koroduadua Waqanibau';