I would try and soften the situation by offering the passengers free drinks or refreshments. I would say to them that I was extremely sorry for what had happened and that I can assure him/her that it won’t happen again. I would then assess their response to see whether or not they wanted to take the matter further. If they did, then I would speak to my senior member of the cabin crew team. Having said that, reporting a work colleague would be a last resort and I would try my hardest to resolve the situation on my own.