Capture the first available appointment and write that to a property

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Does anyone know of a method to capture the first available appointment and write that to a property in OFSC so it can be pushed into the Dailiy extracts?

Essentially, we want to capture what the first available appointment is when an activity is rebooked via the OFSC Mobility 'Book new activity' function regardless of what appointment is selected. EG Activity is booked for Friday the 13th yet first available appointment is Tuesday the 10th.

The 'Book new activity' function triggers the 'Activity Add' Message Scenario sequence so it's relatively simple to capture the actual rebook date however at the same time we want to capture what the first available appointment was.