Dear George:
I may have what you're looking for. I copied it from an old (1993, I think) issue of Sing Out. I think it was made up by the staff of a children's camp (The Flying G Ranch Staff). It goes like this:

PUFF, THE HAPPY ENDING
(The Flying G Ranch Staff)

One fine day it happened. Puff woke from a dream.
He thought he heard a familiar voice and Jackie's laugh, it seemed.
He looked around his cavern, and over near the door
Stood a little boy with a piece of string and a smile he'd seen before.

"Hello, my name is Billy, my dad told me your name.
He said I’d find you in the cave along the Cherry Lane.”
Puff, the magic dragon, smiled in his joy.
He'd never be alone again, for this was Jackie's little boy.

OH....

I found this in the Fall '93 (I think) issue of Sing Out.