I have used normal office shoes on look road pedals (albeit shoes with relatively thick soles) This works fine for to/from work or lunchtime errands.
However I found that pedalling on the "underside" of the pedal was more comfortable in some thin-soled shoes. Not ideal but workable.
Another option, try clipping a plastic cleat in the pedal, an older and worn-out one would be perfect. Plus you can remove it when you want to ride with proper shoes.
I have look clipless on my road bike, but I put platforms back on my MTB for trips around town, mostly because our roads are still terrible, and the MTB has better brakes and more load-carrying capacity.
Cleats may not be best for you.