Cancellation question

Hi everyone, thanks for your patience. I'm trying to find my answer on the website and it just isn't working as the situation is a little overwhelming. I I'm planning to fly home for Thanksgiving on Alaska, but recently found out that I'll need to reroute myself due to attending a funeral. I want to keep my original second flight after Thanksgiving but I won't need to take my departing flight. Is there a way to cancel just the first flight and get my money back or do I have to cancel the whole reservation? Saver fare