HappyRobot, an artificial intelligence startup that automates communications including rate negotiation and appointment booking for freight operators, has raised $44 million in a funding round led by Base10 Partners. The San Francisco-based firm did not disclose its valuation in Wednesday's statement. A source familiar with the deal said the Series B round valued HappyRobot at around $500 million. Existing investors Andreessen Horowitz and Y Combinator also took part in the round, along with