My companion and I have RT tickets on the same PNR to Hawaii in a few weeks (took advantage of that 40% coupon from awhile back). Looks like due to work issues he's going to need to fly back early on United. I will be keeping my original return flight. Is it easy to cancel his portion of the return online and not mess my flight up? Is it better to call and have an agent do this? I usually fly alone or on solo PNRs so have little experience with changes made when there's more than 1 person traveling.