Conversational agents are becoming widespread thanks to the development of natural language processing and deep learning techniques. NESTORE is a virtual coach designed to support seniors during their journey to wellbeing. This virtual coach interacts with the user through two different type of conversational agents: a text-based chatbot integrated in a mobile application and a tangible coach, which is a physical object based on vocal interaction and tangible interaction. This paper presents the design of each conversational agent interface developed to support seniors in enhancing their wellbeing. A cloud conversational agent manages the user interaction with the NESTORE virtual coach, which can occur through interfaces with different design, forms and capabilities, i.e., the chatbot and the tangible coach: two different intelligent interfaces with a shared mind.