I cannot think of any off hand that can be covered by either a Sleight of Hand or a Reflex save.
After a quick scan through the SRD, I can't find Dexterity checks other than Sleight of hand or those that specifically mention Reflex saves that could, with a stretch, be covered under Sleight of Hand or a Reflex save.
Non-skill related Strength checks are generally either breaking/opening something or lifting something. Non-skill related Constitution checks are generally made either to continue doing some fatiguing activity or to stay alive.
Non-skill related Dexterity checks are generally something that needs to be preformed with precision, or to keep something level. There aren't as many for dexterity as there are for strength or constitution, but there are more dexterity skills.
To provide an example, your Reflex save wouldn't help you, say, thread a needle or fit complex components together properly, and your sleight of hand skills wouldn't help you thread a needle or fit complex components together.
A Reflex save won't help you keep some container of liquid level to prevent it from spilling, neither would sleight of hand. Your reflex save could keep you from getting hit with the liquid when yuo spilled, and your sleight of hand skills could let you pocket said container of liquid without being noticed.
There are checks that are not skills for a reason.