user: Question: When was Walter Evans a representative?
Columns: ['Representative', 'Years', 'State', 'Party', 'Lifespan']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['John J. Eagan', '1913–1921 1923–1925', 'New Jersey', 'Democratic', '1872–1956']
SQL:

assistant: SELECT "Years" FROM "Table" WHERE "Representative" = 'Walter Evans';