Greg: Hi mom
Greg: I can't come to dinner today
Mom: Hey my sweetheart
Mom: Why can't you come?
Mom: Something's happened?
Greg: No, mum, everything's fine
Greg: I just have to go to the library with Mary
Greg: She asked me and I agreed
Mom: Oh, I see. I'll leave the dinner in the oven for you then.
Greg: Thank you mum, love you
Mom: Love you too
Greg won't be home for dinner as he's going to the library with Mary, Mom will leave him some dinner in the oven.