```mermaid sequenceDiagram participant Alice participant Bob Note over Alice,Bob: Imagine how time flies
when you chat with someone. Alice->>John: Hello John, how are you? loop Healthcheck John->>John: Fight against hypochondria end Note right of John: Rational thoughts
prevail... John-->>Alice: I am great, thanks! John->>Bob: How about you? Bob-->>John: Jolly good! ```