How do I change the value of a field if a condition occurs?

Hi community! I'm using Splunk Entreprise to create dashboards with my client's ServiceNow incident information. 1. My company ***only look at tickets from assignment_group A***. 2. So, I have a ***ticket X*** that belongs to ***assignment_group A*** with ***Status "New"***. 3. However, ***this ticket changed to assignment_group B*** and is no longer serviced by my company. **This will result in a second ServiceNow extraction, that ticket will not appear**. So, I need to create a logic so that ***when this happens, Splunk changes the Status of ticket X to "Reassigned"***. Does anyone know how to do this? Thanks!