The *Booking* sample demonstrates a `synchronization`_ workflow pattern. It waits
for two activities to complete: a car reservation and airline reservation. When both activities complete, it sends a
confirmation. All activities are performed asynchronously.

.. _`synchronization`: http://docs.aws.amazon.com/amazonswf/latest/awsrbflowguide/programming-workflow-patterns.html#programming-workflow-patterns-synchronization