@startuml
autoactivate on

actor User
participant Controller
participant ServiceA
participant ServiceB
participant Model
participant View

User -> Controller: request
Controller -> ServiceA: call
autoactivate off
ServiceA -> ServiceA: some logic
return

autoactivate on
Controller -> ServiceB: call
autoactivate off
ServiceB -> ServiceB: some logic

autoactivate on
ServiceB -> Model: interact
return ...
return ...

Controller -> View: render
return HTML

return HTML
@enduml