What term is used for a situation when a person does not show up for a reservation?

The term "no-show" is widely recognized and used in the context of reservations, such as in hospitality, healthcare, or transportation sectors. A no-show occurs when a person fails to arrive at an appointment or reservation without prior notice or cancellation. This term specifically captures the essence of the situation where the reserved time or space is wasted due to the absence of the individual who made the reservation.

The other terms provided do not accurately represent this situation. "Did Not Arrive" (DNA) may be used informally but is not standard terminology in the same way that "no-show" is. "Canceled" refers to a situation where a reservation is terminated before the arrival time, which is distinctly different from not showing up altogether. "Reserved" simply denotes that a booking has been made and does not imply any action regarding attendance. Thus, "no-show" is the most precise and commonly accepted term in these contexts.