Or at least to attempt to book one !

In a particular case of my own, I was summarily told (when calling a good three weeks ahead of the actual flight date) that “no appointments are available at all”

“ So ……. nothing at any time during the three hours I will be at the airport ?”
“ No”
“Hmm. That’s disappointing”
“The only possibility is if there is a cancellation”
“Ah ……… how would I go about taking advantage of that ?”
“ Well you’d have to keep checking with us”

And there was me thinking (rather foolishly, I know) that - as a gold-standard premium service - I would be asked for my contact info so that someone from the YouFirst team could call ME back in the event of a cancellation