I'm fairly new to UML and have been trying to diagram a scenario for class but I'm stuck on one part. In the scenario three separate, non-exclusive activities can occur. After a client is registered they are able to book a new trip, modify an existing trip or cancel a trip. They can do all or one of that activities until they're all done managing their trips. I have something of a draft but I think it's wrong. I'll post the scenario and the diagram I've drafted.
Once registered, the client has three options:
Book passage - this includes registering a passenger, selecting the destination, drop off and pick up times and paying for the passage. (Note that only on-line payments are accepted when using the web interface)
Modify existing passage
Cancel and refund existing passage (Note: any existing passage has already been paid for).