Ключевые слова: apology, assistance, assistancedenial, clarification, clarificationrequest, communication, constraint, content, customerservice, decline, denial, description, disclaimer, explanation, guidance, help, incapability, information, limitation, nohelp, nonsupport, presenter, refusal, reject, request, response, restriction, service, support, unable, unavailability, unavailable, video, videocontent, viewer,