I can understand having an LLM trained on previous inquiries made via email, chat or transcribed phone calls, but a general LLM like ChatGPT, how is that going to be able to answer customers questions? The information ChatGPT has, specific to Chevrolet of Watsonville can't be anymore than what is already publicly available, so if customers can't find it, then maybe design a better website?
"What is the gas mileage of the Chevy Colorado?"
"What electric vehicles are in your lineup?"
"What is the difference between the Sport and Performance models of the Equinox?"
Feed the LLM the latest spec sheet as context and give it a few instructions ("act as a Chevy sales rep", "only recommend Chevy brand vehicles", "be very biased in favor of Chevy...") it can easily answer the majority of general inquiries from customers, probably more intelligently than most dealers or salespeople.