As a person who travels regularly, I am always amazed by the number of people that have no idea as to the difference between a front desk clerk, a resort host, a guest services rep., and a concierge. While one can sometimes do the job of the other, these are two very different positions with different responsibilities.
Front Desk Clerk
A front desk clerk will check you into your room when you arrive, and check you out when it is time for you to leave. In lower-rate (meaning cheaper, not lower quality) hotels, the jobs of a concierge will be taken care of by the front desk clerk. The front desk clerk will be able to let you know if there is a concierge on duty, or if he or she takes the responsibilities of the position.
Guest Services Rep
In most cases, all of the workers at a hotel that are there to help you out could be defined as guest services reps. There are some hotels, though, that have a standing position for guest services reps. At these hotels, this job is held by someone that is there to simply handle complaints, and to solve complex problems with the patrons.
Sometimes, if you enter a hotel or resort, you might find someone sitting at a desk in the front, or standing at a small podium. This would be a resort host. This person is there to answer basic questions, and to direct you through the hotel or resort so that you know where you are supposed to go.
In upper-scale hotels, and at resorts, you will find that you have access to a concierge. A concierge is a person who essentially works as a personal assistant for everyone staying on the property. He or she will do everything for you (depending on the limits set by the hotel) from calling you a cab to setting a pickup time for your dry cleaning. The concierge is also there to answer more complex questions about what the resort or hotel offers to guests.
The next time that you are at a hotel, make sure that you are taking the correct issue to the correct person. While everyone will be happy to help you out, there is nothing more embarrassing for some workers than having to tell a guest that they are talking to the wrong person.