just tell them you have nothing to report, sorry.
Then they might impress on you the importance of preaching, and you go yes, I understand it, but it is not easy, my heart is not with it, I don't feel the same good vibes like I used to. Then he request you for an appointment, and you agree on next Saturday. On Friday night, you call him to say something has come up (no details its none of his business) . You do this 2 times in a row and he gives up. If you cancel a couple of appointments, the will stop.