“And when the people were gathered thick together, he began to say, This is an evil generation: they seek a sign; and there shall no sign be given it, but the sign of Jonas the prophet.”
King James Version (KJV)
11:29 It seeketh - The original word implies seeking more, or over and above what one has already.
Lu 11:29-32 They seek a sign. See notes on Mt 12:38-42, where we have the same language reported.