@startuml
skinparam monochrome true
skinparam packageStyle rectangle
skinparam shadowing false

title System Sequence Diagram (SSD)

autonumber

actor "Agent" as Agent
participant ":System" as System

activate Agent

    Agent -> System : asks to list all visit requests for properties managed by me
    activate System

    System --> Agent : displays visit request list
        deactivate System

deactivate Agent
@enduml