Dual Agent from MLS

[Tony Otis]

I found a few properties I liked on my local MLS and clicked Request Showing. I get an agent that calls me up and shows me some houses. I have a contract sitting in my email unsigned, saying he's a dual agent.

He doesn't personally represent the seller but his brokerage does. If I don't sign his contract, it means he won't be able to show me properties listed on the MLS.

What would you guys recommend here?  This is my first deal so I'm inexperienced.  I'd need an agent who can represent me and help with negotiations, etc.  

Because he originally toured the house with me, is he entitled to the commission? Or if I want, can I find a new buyer's agent?