We present a dialogue system that automatically generates indoor route instructions in German when asked about locations, using text-based natural language input and output. The challenging task in this system is to provide the user with a compact set of accurate and comprehensible instructions. We describe our approach based on high-level instructions. The system is described with four main modules: natural language understanding, dialogue management, route instruction generation and natural

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... nguage generation. We report an evaluation with users unfamiliar with the system -using the PARADISE evaluation frameworkin a real environment and naturalistic setting. We present results with high user satisfaction, and discuss future directions for enhancing this kind of system with more sophisticated and intuitive interaction.