Automated ticket exchange is available only for the Sabre global distribution system (GDS). The Sabre exchange service validates ticket fare rules and guarantees the exchange. 

Note: Contact your Deem Account Manager to enable automated ticket exchange for one or more sites.

...

Need to know

• Available only with Sabre, coming soon to Galileo.

• Enable Changes under Display Configuration Settings

• Set Travel Policy if needed.

Changing the Display Configuration

...