some dealers outsource their alignment service, so figure out what actually they told you, they are not the one checking the car. Firsyt, check the front tires see if the it is wearing out uneven. or jack up both front wheels/tires, inspect the ball joints, if the rubber cover is already torn or some grease is leaking it might be bad. try also to rock the wheels/tires and see if there is play of the wheels/tires, as I've mentioned it is usually the lower ball joint that goes bad first. Or go to a local tire/alignment shop and have it checked, they will even show you if it is bad or not and they usually do it for free(check-up).If one is bad you have to change both(as in both lower ball joints).