1sequenceDiagram
2    participant Alice
3    participant Bob
4    Alice->>John: Hello John, how are you?
5    loop Healthcheck
6        John->>John: Fight against hypochondria
7    end
8    Note right of John: Rational thoughts prevail!
9    John-->>Alice: Great!
10    John->>Bob: How about you?
11    Bob-->>John: Jolly good!