Well within your rights to ask your dealer's mechanic, what's going to be done. Then ask how much he's charging you for each fluid he's replacing. This is NOT the service cost but for consumables, how much he's charging
There's usually:
1. Engine Oil
2. Transmission Fluid
3. Brake Fluid
4. Coolant Flush
5. Steering Fluid
6. CVT Fluid
7. Sump Plug Washer
8. Engine oil filter
Now also check you can pre-buy all your fluids. That should save you a chunk.
If you need more help, read
this.