Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE technician (Name VARCHAR, technician_id VARCHAR); CREATE TABLE repair_assignment (Name VARCHAR, technician_id VARCHAR)
### Question:
List the names of technicians who have not been assigned to repair machines.
### Answer:
SELECT Name FROM technician WHERE NOT technician_id IN (SELECT technician_id FROM repair_assignment)