Service is related to Voluntary. Voluntary is the opposite of Duty. Duty is similar to Responsibility. Responsibility is derived from Responsible. 
Person wants (to) Support. User is a type of Person. 
Service <--RelatedTo--> Voluntary <--Antonym--> Duty <--SimilarTo--> Responsibility --DerivedFrom--> Responsible 
Support <--Desires-- Person <--IsA-- User 