flowchart TD UI["User Interface
how do I reset password"]:::uiNode subgraph Processing["Input Processing"] direction TB Norm["Text normalization"]:::procNode Syn["Synonym expansion"]:::procNode Embed["Embedding generation"]:::procNode Norm --> Syn --> Embed end subgraph Matching["Semantic Matching"] direction TB Sim["Similarity calculation"]:::matchNode Rank["Ranking algorithm"]:::matchNode Thresh["Confidence threshold"]:::matchNode Sim --> Rank --> Thresh end DB[("FAQ Database
Q and A pairs")]:::dbNode Response["Response Delivery
Top-ranked answer"]:::respNode Feedback{{"User Feedback
thumbs up / down"}}:::respNode UI --> Processing Processing --> Matching DB -. "supplies FAQ vectors" .-> Sim Matching -->|"confidence 0.87"| Response Response --> Feedback Response -. "answer shown to user" .-> UI Feedback -.->|"improve answers"| DB classDef uiNode fill:#7b1fa2,stroke:#4a148c,stroke-width:2px,color:#fff,font-size:14px classDef procNode fill:#1976d2,stroke:#0d47a1,stroke-width:2px,color:#fff,font-size:14px classDef dbNode fill:#ef6c00,stroke:#e65100,stroke-width:2px,color:#fff,font-size:14px classDef matchNode fill:#2e7d32,stroke:#1b5e20,stroke-width:2px,color:#fff,font-size:14px classDef respNode fill:#00897b,stroke:#00695c,stroke-width:2px,color:#fff,font-size:14px linkStyle default stroke:#888,stroke-width:2px,font-size:14px