Pax means person in the hospitality industry.

 Regular reservation has a pre-payment already done

In a hospitality industry ETA means expected time of arrival.

Overbooking is one of the problems encountered by a front desk.

Corporate account usually has a discount rate.

Guaranteed reservation is a loss of the hotel.

If the guest cancels a booking, the reservations is erased in the reservation chart.

In a hotel early departure has additional charge.

Under booking is a gain of a hotel.

Confirmation letter is to confirmed guest reservation.