Oil prices slipped on Thursday as investors assessed whether progress in Iran-Oman talks could pave the way for a U.S.-Iran peace deal to end the five-month war and reopen the Strait of Hormuz. Brent crude futures fell 37 cents, or 0.5%, to $79.08 a barrel by 0024 GMT. US West Texas Intermediate futures declined 53 cents, or 0.7%, to $74.69 a barrel. Brent settled up slightly on Wednesday,