user: Question: What message has HD 186408 as a designation HD?
Columns: ['Designation HD', 'Constellation', 'Date sent', 'Arrival date', 'Message']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['HD 186408', 'Cygnus', 'May 24, 1999', 'November 2069', 'Cosmic Call 1']
SQL:

assistant: SELECT "Message" FROM "Table" WHERE "Designation HD" = 'HD 186408';