For others to say your water pump is good, based on mileage or because THEIR car's pump is fine, is a disservice to you. Some posters have been right on the mark - your water pump can fail at very low mileage and also last the lifetime of the car. Each one is different. That said, I would EXPECT that a water pump would last to at least the timing belt change. But, as the saying goes, s*#t happens.
Water pumps typically have a weep hole on them to allow water that seeps past the shaft seal to drip out. If water is dripping out or even leaking and then drying as it hits the hot engine block, then it is time for a change. For example, I drive a 93 Acura Legend. I replaced the timing belt at 94000 miles and did all of the accessory belts and timing belts and water pump. there was evidence that the water pump shaft seal was starting to leak. I saw bits of dried green "stuff" in the vicinity of the weep hole. Apparently this pump would leak but it never leaked enough to show outside of the cover or as drips on the ground.
The only time I have heard a failing water pump, it was a dry sort of very light scraping sound. It was almost not discernable over the sound of the engine. I would guess that if the failing water pump were allowed to go long enough, you could get a very loud sound.
So, I would do as others have suggested and ask the dealer the big WHY question. Why does he think that the water pump needs to be replaced? Secondly, when I used to have dealers do this work, I always asked for the take off parts back.
Gary