user: Question: What is the date of birth of the Goalkeeper from the 1st season?
Columns: ['Name', 'Date of birth', 'Position(s)', 'Seasons', 'Matches & (Goals) (League + Finals + KNVB-Cup)', 'Previous club']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Goalkeepers', 'Goalkeepers', 'Goalkeepers', 'Goalkeepers', 'Goalkeepers', 'Goalkeepers']
SQL:

assistant: SELECT "Date of birth" FROM "Table" WHERE "Position(s)" = 'Goalkeeper' AND "Seasons" = '1st';