What kind of "practical" are you trying to complete? A practical exam for a class? A practical test for employment consideration? A practical review for a bonus at work?
Not trying in any way to be a smart-alec, simply trying to be responsible... What are you asking for?
Do you need to link one individual to more than one service? If so, you have a many to many relationship. (You need to be able to link many individuals to many services.) This requires an additional join table that "links" your other two tables.