digraph models_diagram {
    graph[overlap=false, splines=true]
    "Venue" [shape=record, label="{\
      Venue|name :string\l\
    }"]

    "User" [shape=record, label="{User|\
      email :string\l\
      password :string\l\
    }"]

    "Order" [shape=record, label="{Order|\
      name :string\l\
    }"]

    { rank=same; "User" "Venue" }

    "User" -> "Order" [arrowtail=odot, arrowhead=crow, dir=both, label="request"]
    "User" -> "Venue" [arrowtail=odot, arrowhead=crow, dir=both, label=agent]
}