Water taxi - room for 2?

Might be a long shot but I’m looking for 2 open seats on a water taxi on 2/16 and 2/18. We have 2 adult kids leaving 2/16 and 2 more on 2/18. The 7:30 am ferry is the only option to get them to STT in time fir their flights in the afternoon.
Anyone using a water taxi those dates with room for 2 more?