Reserve: how do you interpret the agreement on "owning" a reserve trip? I know that the new rules would allow for ownership of your reserve assignment trip from other pilots taking it but what about from the company changing the report time to an earlier time?

Let's say you're on PM reserve and the day before your reserve block starts scheduling assigns you a trip that reports at 18:00. You acknowledge the assignment and elect to "own" the trip. Can they still assign you a trip that reports earlier or are you relieved of being on call prior to the trip report time? (As is the case for most other carrier's reserve rules).