Sure! It depends on the level of contact. If the listing agent simply provides information about the listing, they are only providing general information. However, if the listing agent is the agent to actually show the property, and dual agency has been agreed upon, then the seller will have an obligation to that agent as a representative of the buyer as well.
However, should the client only obtain information from the listing agent, but have another Realtor show the property, that is perfectly fine.