Protocol to Switch Realtors

[Rickie Mincy]

To give a little back story, I'm new to real estate and I'm starting off with SFH, low range. My bank referred me to my current realtor, not sure if that's a good or bad thing. He went through 1 showing with me, asked a couple questions about what I was looking for and stated he works with mostly investors. After that showing he pretty much went ghost and now has me working through his assistant for all showings and communication. This past weekend the assistant was out of town and I had interest in seeing a property, I reached out to the Realtor and he advised he didn't have any availability, as luck would have it, that house is now under contract. His assistant is not licensed and is only available to show on the weekends. I value ones time but I could be missing out on a great deal. Is this type of behavior normal and what is the proper protocol should I want to use different realtor?