Why won't my dimmer dim CFL Lights?
There should be an adjustment dial or slider somewhere on the switch (you'll likely have to remove the cover plate to access it), which allows you to adjust the lower end of the dimming range. Where exactly the adjustment dial is will depend on the switch you're using.
To make the adjustment:

Turn on the light
Turn the dimmer all the way down
Turn the adjustment dial clockwise (up) to lower the light level.

Models and manufacturers vary, so you'll have to determine which way to adjust the dial/slider by moving it one way then the other. Follow the instructions provided by the manufacturer.
Once you have the level set, install the cover plate and enjoy your romantic dinner.