Urban Company — urban clap cancelled service 30 minutes before

I had booking at 8:30 am but i got a message at 7;30 apologizing for their delay in assigning staff. And when i check back my account, i couldn't find the booking i did, it got cancelled. Ppl will be having commitments. What if they cancel like this. If they don't have enough staff for the selected slot they shouldn't allow to book the slot. Though it's salon services, it's important to those people please value their time