So I messed up quite badly.... I booked a trip to Malia with two mates and we've already payed for it. I'm going to uni after the summer and I realise that I'd prefer going on holiday with my gf than my mates. One of them has ensured it, so it's fine, but the other one hasn't... I have ensured it too, so I'd get my money back and all fine, but one of my friends would either have to go on his own or find more people to go which is unlikely. The other one is also on the verge of not going. So what would be a good excuse that would be understandable? Please take into account that we all work in the same place