If the OP is wise, he/she will do the following:
Open the glove compartment, take out the Owner’s Manual (perhaps for the first time?), and see what the folks who designed and built the car have to say. To the best of my recollection, it says to replace the timing belt at 105k miles OR 7.5 years, whichever comes first. If my recollection is correct, you are due to change that very vital part now or in the next few months.
Get price quotes from independent mechanics in your area for replacement of the timing belt, serpentine belt, water pump, and all belt tensioners. Even though only the timing belt is the “required” maintenance, replacing all of these items at this point will actually cost less in labor costs than if you had the so-called “extraneous” items done later. Most likely, you will have a hard time finding a better price than what the dealer is quoting, as it is a very good price for this work.
The dealership is actually doing you a favor with their reminder, as failure to replace this belt will–at some point–result in catastrophic engine damage. Your choice–$500 now or…perhaps $2,000 later when the belt snaps.
You REALLY need to become familiar with what is necessary to keep your car running properly. Car maintenance should not be a mystery, especially since the reference source needed to know about this topic should be sitting in your glove compartment and it is written so that any adult can understand it.