Not here to answer your question but as a detailer you'll need to air dry the water out assuming you've already vacuumed or extracted most of the water out. You don't want rust or mold to develop.

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Is the door completely closed? Is the window all the way up? Does your model have a sunroof?

 

If you want to speed along the process of troubleshooting and eventual repair, look for the leak yourself. Use a hose if necessary. Dry the inside of the car out, and get to the dealer quick before it rains again, good luck!

 

Esselle, if you have a sunroof, most likely one of the 4 drains are clogged. Open sunroof and check in each corner for a small, maybe 1/8" drain hole. Best to blow compressed air into drains. Could also run weedeater nylon cord line down the drain. Do NOT use anything sharp in drain, like safety, wire since the drain flows into a rubber tube, down the pillar, and onto ground. Hope this helped. I had found pine needles clogging my 2011 Sonata and caused floor to flood during downpour. Recently ran an ozone generator inside vehicle to rid it of ongoing musty odor. Worked great!

 

One way to help find a leak is to turn the heater fan on all the way, and adjust the cooling system to pull in outside air; then run a smooth and slow stream of water from a hose over all the exterior seams. The leak will show as air bubbles escaping. Sort of like checking an inner tube for a leak. Windshields have been known to leak, so check it out along with the doors and moon roof.