receptionist, clerk

Could you please do something for me? (polite form)

reception, acceptance / receptionist, information clerk / information office, information desk

receive, accept

reservation, booking / appointment; an arrangement for a meeting / subscription

reserve / make an appointment / subscribe

confirmation

confirm, make sure, check, verify

person in charge; person responsible

in charge; in the position of responsibility / liable to; subject to / obliged; duty-bound