Translation of secretariat in Spanish

We drove to the hotel Rex where we made reservations in advance. However, once there, two American guys told us that they had a voucher from a travel agent and the price was like half of it.
We agreed to meet the next day at seven thirty to avoid the crowds at the entrance. Dinner was great. We went to a restaurant on the main street. The building was French architecture.
Fortunately and against all odds there were seats available so that we changed our booking to the same day. Our destination was El Calafate in the South of Patagonia in order to see the glaciers.