lunch lady or cafeteria lady
a waiter or waitress
Waiter
Someone who serves food is called a "waiter" or a "waitress" and sometimes called "staff".
In today's society being gender free or politically correct, the person who serves food in a restaurant is sometimes called a 'server'. The is the classification under 'wait staff'. Some restaurants still refer to servers as waitresses or waiters.
waiter
A horrible person.
maintain homeostasis
A steward or a stewardess.
IT IS CALLED CONSUMER!
A person who serves of his or her own free will is officially called a volunteer.
peer
Usually that is the nurses job.
barista is the official name of someone who serves coffee
A Host or Hostess is the person who meets the guests and shows them to their tables.