AI (Artificial Intelligence) letters are placed on computer motherboard in this illustration taken, June 23, 2023. REUTERS/Dado Ruvic/Illustration/ File Photo Purchase Licensing Rights, opens new tabSept 3 (Reuters) - 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 Wed...