How to clean up audio and make it crisp using Adobe Audition?

So during a video interview recording, we were having trouble with our microphone and recorded the audio using the iPhone's voice recorder app. As we were reviewing our footage, we discovered that the microphone did in fact shut down in the middle of recording, so all we have now is the audio recorded from the iPhone.

Unfortunately, the iPhone was merely placed on the floor and picked up all of the background noises. The voices of the speakers have a really high reverb and it sounds like they're speaking through a fishbowl. I'm trying my best to cleanup the audio, but I'm not very familiar with the software. Will there be a way to clean up the audio and to isolate the voices of the speakers?

There's not a lot you can do to make it sound "clean"; sound is sound.
Other than removing frequencies outside the vocal range anything you do will affect the voices as well as the unwanted noise.

Use equalisation, removing everything below 200Hz and above 4KHz. You can tighten that in a bit, to a limit of around 300Hz & 3KHz - just see what works best.

You may be better off working on the audio in Audacity before importing to Audition, it's likely to give you more options and control.