Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE services (service_name VARCHAR)
TABLE: CREATE TABLE party_services (service_id VARCHAR)
TABLE: CREATE TABLE services (service_name VARCHAR, service_id VARCHAR)

### Question ###
Find name of the services that has never been used.

### Accurate SQL ###

SELECT service_name FROM services EXCEPT SELECT t1.service_name FROM services AS t1 JOIN party_services AS t2 ON t1.service_id = t2.service_id