Explore the intersection of Human-Computer Interaction and Natural Language Processing in this 18-minute lecture that examines how conversational AI systems can be designed with human-centered principles. Learn about the fundamental concepts that drive effective human-AI communication, understanding how HCI methodologies inform the development of more intuitive and user-friendly conversational interfaces. Discover the role of NLP technologies in creating AI systems that can understand, process, and respond to human language in natural and meaningful ways. Gain insights into the design considerations that prioritize user experience and human needs when building conversational AI applications, exploring how these technologies can be optimized to facilitate seamless interaction between humans and artificial intelligence systems.