Book and manage appointments through a Telegram bot

flowchart TD trig>"client messages the bot"]:::trig s0["receive telegram request"]:::task s1["classify request type"]:::task s2["check calendar availability"]:::svc s3[("confirm and save booking")]:::store trig --> s0 s0 --> s1 s2 --> s3 gx{"× book cancel or list"}:::gate s1 --> gx p00["check availability"]:::task gx -->|"booking request"| p00 p01["confirm and save"]:::task p00 --> p01 p10["remove appointment"]:::task gx -->|"cancellation request"| p10 p20["show upcoming appointments"]:::task gx -->|"list request"| p20 p01 --> s2 p10 --> s2 p20 --> s2 out[/"appointment booked cancelled or listed"/]:::out pay{{"self-serve scheduling with no back and forth"}}:::pay s3 --> out 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