Equalizer had the same problem and solved it by heating the food
slightly in the microwave to entice his kitty. I have the same problem
with my cats preferring dry food. I let them both kinds.

If you are leaving dry food out all day that is part of the problem.
Part of successfully getting a cat to eat canned is to make sure they
have an appetite. A cat that is allowed to snack all day has no reason
to eat anyhing you offer. Feeding scheduled meals 12 hours apart with no
food left out inbetween is the best way to create that appetite. It is
also beneficial because you know exactly what your cat is eating and if
it stops eating because of an illness you will figure it out a lot
sooner.  

Second, a lot of people make the mistake of feeding the same thing day
in and day out. This can make a cat picky to where it won't eat anything
else, or where it will get sick of what it is eating and refuse it.
Feeding a variety of flavors is much better. My cats never get the same
thing twice in a row. I have had many cats that were dry food junkies
when I rescued them and absolutely would not touch canned food, but with
time and patience I have been able to transition every single one of
them to canned.

Megan

                                   

One way to transition a cat to canned food is to first start out by
moistening the dry food when you feed that so the cat gets used to a
moister consistency.  You can also make a powder of the dry food by
putting it into a cheescloth for example and lightly smashing it into a
powder with a hammer.  Then take that powder and mix it into the canned
food.  You'll want to keep using less and less of the powder until the
cat, hopefully, is eating the canned food alone.

Lauren