It depends on the studio. Some charge nothing, some keep the deposit, some charge a set fee. Their policy is shown on the booking page before you confirm and again in your booking details.
If it was genuinely unavoidable, tell them. A message explaining what happened is worth far more than silence, and a professional who understands why is usually willing to waive a fee once.
What does real damage is repeated no-shows without contact. A studio can decline future bookings from a client, and most of the ones who do are reacting to a pattern rather than a single bad day.