If they don't accept crypto as a form of payment, sell your crypto and get the cash you need.
However, I'd suggest you study the market, so you could understand when it is the best moment to sell your cryptos.
You may use different trading platforms to help you identify when the price will go up or down.
By the way, this is how I make money.
Finally, if some of you would like to buy bitcoins, I'd suggest checking this site
https://bitcoinsource.co.uk. It is the site where you can find the best and most trustworthy bitcoins providers.