Well, when I have auditory hallucinations I usually just hear noises or single words, not conversations.

Examples:
I was taking a shower and had my back to the curtain. A man's voice came right up as if whispering loudly in my ear "HEY!" I screamed. I thought it was my husband playing a prank on me, but no, I was alone and he was asleep.

Another time I was driving down the road. I see an ambulance coming toward me. Instead of a siren, the ambulance is a man's voice screaming in agony (but as loud as a siren.) That same day, I heard it again while I was washing the dishes.

It's very scary and it sounds like it's right in the room with me or all around me when it happens.