Place this clip at the point where the search fails and the scene cuts away, then follow it with the Hello Darkness My Old Friend sound if nobody answers, or end the sequence there when the missing person finally walks back into frame.
About this sound
This is a 4.7-second sung excerpt with a voice singing the German words for 'where are you, my sunlight'. It feels earnest and melodramatic, turning a search for a missing person into an exaggerated romantic plea. It comes from Grup Tekkan's studio version of 'Wo bist du, Mein Sonnenlicht'.