Conversational AI platform Yellow Messenger has raised $20 million in Series B funding led by Lightspeed Venture Partners and Lightspeed India Partners. In 2019, Lightspeed India Partners had led the startup's $4 million Series A funding. Founded by Raghu Ravinutala, Jaya Kishore Reddy and Rashid Khan, Yellow Messenger offers enterprises an AI platform to build conversational bots for customers.