CourseAI Engineering: The Complete Course · Module 8: Retrieval-Augmented Generation (RAG) · part 63 of 105

Part 63 · Module 8: Retrieval-Augmented Generation (RAG)

Lesson 4: Answers that stay inside the help centre

18 min read·13 Oct 2026

Module 8 · Lesson 4 · About 40 minutes · Needs: Module 7, Lesson 2 (structured replies), and Lessons 1 to 3 of this module (chunks and retrieval)

The situation

Aisha Rahman writes: "Can I return my robot vacuum from order 5521?" Your retriever from Lesson 3 can now find the help-centre chunks about returns. What it cannot do is write the reply.

Priya sets three rules. The answer must come from BrightCart's help centre, not from what a model remembers about shops in general. It must name the article it used. And if the help centre does not say, the assistant must say "I don't know, let me get a person." This lesson builds generation, the half of RAG that turns retrieved chunks into a checked answer.

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