If you invite someone to become a connection in error, you can withdraw the connection request before they accept it.
Select Settings in the navigation pane.
On the Settings page, expand the Connections pane.
Click the Withdraw button in the Connection Requests Sent section for the appropriate request.
On the confirmation dialog, click Yes to confirm the withdrawal; click No to cancel it.
The Connection Request notice won't display when they log in; however, the request email is still sent.