ARC recommends agents process all voids, refunds or exchange actions directly in their GDS. In doing so, this updates both the carrier electronic ticket (ET) database and the Passenger Name Record in the GDS. Voids and refunds performed in Interactive Agent Reporting (IAR) do not update the agency's PNR; only the carrier's database is updated. Please note that not all carriers support IAR e-ticket EDIFACT messaging. For a complete list of carriers that support these capabilities, click here for ARC's Carrier Ticket Matrix.