user: Question: Name the into service for DH1
Columns: ['Number', 'Serial Number', 'Into Service', 'Withdrawn', 'Scrapped']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['DH1', 573.0, '4/1962', 'Example', '2004']
SQL:

assistant: SELECT "Into Service" FROM "Table" WHERE "Number" = 'DH1';