When someone goes on a wild goose chase, they waste a lot of time searching for something they have little chance of finding. They could have been given incorrect information before they started their search, which would lead them on a wild goose chase, or someone could have made them believe there was something to find. This idiom is more commonly heard in social situations rather than professional environments.
The dog was sent on a wild goose chase when the frisbee went into the trees.
The call centre operative sent the customer on a wild goose chase because he didn’t want to deal with the tricky call himself.