title: Event Sourcing, Conflict between two services in processing same event
body: <p>I started learning about event sourcing and CQRS, but i didn't get something right.</p>
  
  <p>If i have two services that both process the same event but in different ways (for example in booking sample, one service checks timeslot and another checks user credit), and one of them accepts the event but the other one doesn't, what should the system do?</p>
  
  <p>How should the services know if other services have accepted or declined the event?</p>