If it was a last minute call out for the crew, then all the F trained crew who are not available is a red herring. You play the cards you are dealt, not what is still in the card factory. It’s far from ideal and I’m sure they were being supported by the IFM. It’s not a bad thing that they told you, as you would be well within your rights to be very irritated should you get sub standard service with no explanation. You may still be irritated as you didn’t get (quite) what you paid for, but I’m sure most would happily go on schedule than wait several hours for a suitably qualified crew member. This is the real world as opposed to an ideal one. That said if you are a lawyer or from the “wrong”🤪 side of the pond, such subtleties may be a little over your head. And yes that is me being patronising😂