This link goes to the WGN Radio Web site's audio file of the "Meet Cubs Management" session of the 2010 Cubs Convention. (You can find all the available media files for this year's convention here.) Jessica's now-legendary appearance takes place toward the end of the file - and it does not disappoint!
I didn't actually download the MP3, I just used the embedded media player, so I'm not sure of the exact time of her appearance. I'd suggest fast-forwarding about 75% through if you really want to hear it as quickly as possible. I believe Al's question is also here, but it occurs much earlier (probably around halfway point).
Honestly, the session is worth hearing in its entirely. Most of the questions (including Al and Jessica's, of course) are good ones, and it's interesting to hear the responses (not that any of the panel's remarks will likely surprise you). If anyone has the tech know-how to isolate Jessica and Al's questions and post them separately, please feel free.