Making room reservation for the clients over the phone or the Internet is also the responsibility of the receptionist. At times, they will also have to deal with booking cancellation.
Giving instructions and managing other internal support staff like porters, and house keeping personnel is one of their duties. They will also have to interact with the management and give them required information.
Read more at Buzzle: http://www.buzzle.com/articles/hotel-receptionist-duties.html