Run a Facebook Messenger chatbot with human handoff

flowchart TD trig>"customer sends messenger message"]:::trig s0["receive message and attachments"]:::svc s1["classify need for human"]:::task trig --> s0 s0 --> s1 gx{"× needs human review"}:::gate s1 --> gx p00["write context aware reply"]:::task gx -->|"AI reply"| p00 p01["update conversation memory"]:::task p00 --> p01 p10["route to human admin"]:::task gx -->|"human handoff"| p10 p01 --> out p10 --> out out[/"instant reply or human handoff"/]:::out pay{{"fast responses without mishandling sensitive cases"}}:::pay out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff