Mi hermano me dijo que estás invitado a su boda. - ¿En serio? Pero si no me conoce.My brother told me to tell you that you're invited to his wedding. - Really? But he doesn't know me.
El presidente no me conoce, pero te conoce a ti. Tienes que llamarlo y pedirle que nos ayude.The president doesn't know me, but he knows you. You have to call him and ask him to help us.