When the steering wheel is at the end of its travel (completely left/right) it is normal that the power steering pump starts making some extra noise
At max travel, the steering pump will produce its maximum pressure and will have to work the hardest. This will create a "hissing" type noise.
When the fluid level is low, then you will hear the pump moaning the whole travel range. You could easily check the fluid level yourself, there is a small dipstick fixed on the bottom side of the fluid fill cap. (the cap itself has a yellow decal with a steering wheel on it)
The pump itself is just at the right side of the alternator when standing in front of the engine (It's been a while since I've seen one of those in the shop, so the location may be different).