Hi Delfin -- are your users allowed to use Google? (I think you mentioned in another post that you are at Stan Chart and I know security at banks tends to be much higher.) Because if you are able to use Google, you could set up a Google Sheet and iframe that into your group / space with an HTML widget.
If you are not able to use Google, you could create a document, say, "Booking Your Parking Space," within your Jive group / space and simply have users edit it. (It's essentially the same process as what you would do with Google Docs but the editing process is a little clunkier.)
And lastly, Jive's Google integration is coming soon which could make all of this easier: Deep Dive: Google Docs Integration for Jive-n, so you may want to keep an eye on those posts.
Thanks Yen. I think I will just use the Jive document editor since Google docs dont seem to work either.