Live Person Inc. Shares of LPSN plunged 41.2% to a seven-year low in premarket trading on Thursday, after the provider of natural-language chat services using conversational artificial intelligence reported a fourth-quarter loss and revenue decline late on Wednesday gave information. During the quarter in November, LivePerson said its WildHealth subsidiary was notified that Medicare was suspending reimbursement for services pending further review. The company stated that it believed that the services provided were lawful, given the uncertainty as to the amount of further reimbursement, that it held a reserve for the revenue associated with the services.