DreamKG: A KG-Augmented Conversational System for People Experiencing Homelessness

People experiencing homelessness (PEH) face substantial barriers to accessing timely, accurate information about community services. DreamKG addresses this through a knowledge graph-augmented conversational system that grounds responses in verified, up-to-date data about Philadelphia organizations, services, locations, and hours.

Unlike standard large language models (LLMs) prone to hallucinations, DreamKG combines Neo4j knowledge graphs with structured query understanding to handle location-aware and time-sensitive queries reliably. The system performs spatial reasoning for distance-based recommendations and temporal filtering for operating hours.

Preliminary evaluation shows 59% superiority over Google Search AI on relevant queries and 84% rejection of irrelevant queries. This demonstration highlights the potential of hybrid architectures that combine LLM flexibility with knowledge graph reliability to improve service accessibility for vulnerable populations effectively.

PS: DreamKG is developed as part of the NSF-funded Proto-OKN (Prototype Open Knowledge Network).