user: Question: What is the role of the aircraft that has a registration of S5-HPB?
Columns: ['Aircraft', 'Origin', 'Role', 'Registration', 'Number']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Agusta Bell 206', 'Italy', 'Policing', 'S5-HPD S5-HPE', '2']
SQL:

assistant: SELECT "Role" FROM "Table" WHERE "Registration" = 'S5-HPB';