He first meets with Lady Macbeth to talk about the king's arrival. They talk about formulating a plan to kill him until nothing can stand in his way of being the King of Scotland.
Explanation:
He meets with the king the next morning. At the end of their talk, Lady Macbeth says to Macbeth that he needs to leave it all to her. Lady Macbeth also tells him to act innocent, but still have the urge to kill him inside.
