Hi all, I am (hopefully) travelling to UK with my 18yr old to visit elderly parents. I have booked for 7 weeks. My son has now said he would like to come home sooner, after three weeks. We are travelling with Singapore air, I am wondering whether we will be able to change just one persons flights, if so, whether it will be likely there will be available seats, and whether we should try to change it before we go or once we were there? Sorry for the amount if questions in one posts. Thank you all for your knowledge 
