You thought Cheese was always by Cream's side, that Cheese would never leave her side. And yet you found the Chao alone at a lake. He was yelling.

"Chao chao!"

You walked on over to help the Chao. Maybe you can help it find Cream.

"Chao Chao Chao, Chao Chao. Chao! Chao? Chao!"

Possibly help it... you couldn't speak it's language.