How to promote products to hotels? Which department should I call?

I was once a salesman. We sell drinks in Beijing. Usually we look for the purchasing department. There is also to see what products you make. If the hotel is small, we will go directly to the boss. Sometimes the usher will ask you. Ignore him, be sure to find an honest man and ask their leader's last name. If the leader is here, go directly to him, hand in your business card and get to the point. Some bosses don't have time to chat with you, so they can talk about family matters when they go there for the second time. You must remember to go to the store often to get acquainted, and things will be easy in the future.