IPA: /ˌrɛzərˈveɪʃənɪst/
KK: /ˌrɛzərˈveɪʃənɪst/
A person who is responsible for managing and taking reservations, often in the context of hotels, restaurants, or travel services.
The reservationist helped us book a table for dinner at the restaurant.
Reservationist → It is formed from "reservation" (from Latin "reservare", meaning to keep back or hold) and "-ist" (meaning a person who practices or is concerned with). A reservationist is a person who is involved in making or managing reservations.
Think of someone who 'keeps back' or 'holds' a spot for you — that's what a reservationist does.