Well, it was a really unstable 2 lucid dreams, but I did in fact talk to a dolphin.

I went to a gym (?), and remembered the task.
I met a 'famous' dolphin in the gym, who had decided to leave the ocean.
He spoke like all my other DC's and walked on his flippers, and explained how he left the ocean, etc etc
It was very fuzzy, and silly, and downright stupid

I'll try it again, but in the meantime I'm claiming success (albeit an unexciting one)