user: Question: What was launched and laid down in February 1819?
Columns: ['Name', 'Built by HM Dockyard', 'Ordered', 'Laid down', 'Launched']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Alacrity', 'Deptford', '13 June 1817', 'October 1817', '29 December 1818']
SQL:

assistant: SELECT "Launched" FROM "Table" WHERE "Laid down" = 'February 1819';