I presume there is a bit more to this story, otherwise he would have been in the airport at the time concerned. But frankly this is just too late, even a Prem wouldn't be able to count on avoiding a no-show on this, moreover with the baggage issue coinciding with the twice yearly flight amendments coinciding with the start of English state school holidays, he did quite well to get answered in 25 minutes.

It's the sort of mistake someone only makes once in a lifetime, but this one is down to personal responsibility, assuming that concept still exists.