This is a first Choreograpy model. It consists of two Choreography Tasks.

The first Choreography Task is  Request Booking as an interaction between two participants – the Runway Show Management and the Venue Provider. We know from the coloring that the Runway Show Management is the initiator of this interaction. We also know, that at least one message must be exchanged between the participants in the course of the interaction, maybe more.

The second Choreography Task is Confirm Booking. Here the same participants are interacting as before. So we see, that the participants are part of the Choreography model and can be referenced by different Choreography Tasks. However in the second Choreography Task the Venue provider is the initiator of the interation.

We know from the sequence flows between the Choreography Tasks, that the Confirm Booking Task follows after the Request Booking Task.

If you are interested to learn how to model choreographies, I invite you to my training classes.