American Express announced today that it has acquired Mezi, the AI-based virtual travel assistant, for an undisclosed amount. After the deal closes, Mezi will become a wholly-owned subsidiary of American Express. Its technology is already powering AskAmex, a personal concierge app for cardholders that launched its pilot program last year. Mezi users send requests for flights, hotels and restaurant reservations through the app’s SMS-like interface. Mezi then makes suggestions and, once it figures out what users want to do, forwards requests to human assistants to finalize bookings. Founded in 2015 as a personal shopping chatbot, Mezi builds its own deep learning and natural language processing systems instead of using services by IBM Watson and other providers. Its co-founders, CEO Swapnil Shinde and his twin brother, CTO Snehal Shinde, previously launched Indian streaming music service Dhingana, which was acquired by Rdio in 2014. After selling Dhingana, the Shinde siblings crea...