The travel supplier didn't clearly state the blackout dates today; how can I avoid issues after sending the quote?

I was working on a quote for a niche travel product today. The supplier's spreadsheet only mentioned peak season surcharges and didn't put the blackout dates in a prominent place. The client happened to want to book for a holiday weekend, and if I had sent it out at the regular price, it would have been very difficult to explain later. I first had the supplier confirm the available dates and net…