What is the origin of the Myth of Narcissus and Echo?

We did a whole unit on mythology and I learned and read ALOT! Echo and Narcissus is greek and here's the story I remember reading..." One day Echo was climbing a mountain after being told he was annoying and talked too much. He said something and narcissus said as a punishment for being to annoying and talkative he may not speak unless spoken to and has to repeat everything that anyone says". It was a much longer story but that's what I remember...hope I answered your question!