It's hard to understand what you're trying to say here.
I am going to exchange BTC at casino.
You meant by launching an exchange? Why not just launch it on your own? or is it going to be a Bitcoin ATM ?
I had a lot of talk with hotel officials.
They did not know bitcoin.
They ask how the exchange will help the hotel.
An exchange could help the hotel by quickly converting the bitcoins of their customers in to cash. The cons in launching an exchange at their hotel/casino is that you don't know if there's a demand for it since none of the officials that you talked with doesn't know anything about Bitcoin.