Lot changes gods mind?

Gen 19:17 says, “And it came to pass, when they had brought them forth abroad, that he said, Escape for thy life; look not behind thee, neither stay thou in all the plain; escape to the mountain, lest thou be consumed.

19:18 And Lot said unto them, Oh, not so, my LORD:

19:19 Behold now, thy servant hath found grace in thy sight, and thou hast magnified thy mercy, which thou hast showed unto me in saving my life; and I cannot escape to the mountain, lest some evil take me, and I die:

19:20 Behold now, this city is near to flee unto, and it is a little one: Oh, let me escape thither, (is it not a little one?) and my soul shall live.

19:21 And he said unto him, See, I have accepted thee concerning this thing also, that I will not overthrow this city, for the which thou hast spoken.

19:22 Haste thee, escape thither; for I cannot do anything till thou be come thither. Therefore the name of the city was called Zoar.”  Shouldn’t an all-knowing god know that Lot would want to go to Zoar?  Why try to send him to the mountain?  God should have seen this twist coming.