Book and cancel meetings by chatting with a Telegram bot

flowchart TD trig>"client messages the bot"]:::trig s0["read message intent"]:::task s1["update the calendar"]:::svc s2["send confirmation reply"]:::task trig --> s0 s1 --> s2 gx{"× booking or cancellation"}:::gate s0 --> gx p00["create calendar event"]:::task gx -->|"booking request"| p00 p10["find and remove event"]:::task gx -->|"cancellation request"| p10 jn{"○ before reply"}:::gate p00 --> jn p10 --> jn jn --> s1 out[/"meeting booked or cancelled"/]:::out pay{{"no scheduling back and forth"}}:::pay s2 --> 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