Sorry if this is answered somewhere already, I've searched a few ways and see nothing obvious.

I have an existing trip planned for a Saturday in early November on AC Vacations, flying on a regularly scheduled flight.

I now appear to be required to be in Europe the week prior. At best, I get home around noon Friday, at worst, late in the evening. Will be flying AC.

So the question is: can I somehow tie the trips together, so that AC is aware that I am on a trip the next day, and somehow prioritize me if a flight gets pooched and they need to rebook me?