19. The apparatus as recited in claim 18 wherein the first voice signals comprise the voice of a virtual assistant, and the second voice signals comprise the voice of a helper to the virtual assistant.
19. The apparatus as recited in claim 18 wherein the first voice signals comprise the voice of a virtual assistant, and the second voice signals comprise the voice of a helper to the virtual assistant. 20. The apparatus as recited in claim 19 wherein the second voice signals comprise recorded voice signals.