What does lady macbeth tell her husband in act 3 scene 2

Act 3, Scene 2

Lady Macbeth asks a servant if Banquo is already gone. When she realizes he has, she asks the servant to get Macbeth for a little chat. Macbeth comes along, and Lady Macbeth tells him to look more chipper and not dwell on dark thoughts, as "what's done is done.