If you are curious about the topic check out the book "Never Split the Difference: Negotiating As If Your Life Depended On It" written by FBI hostage negotiator

If you are curious about the topic check out the book "Never Split the Difference: Negotiating As If Your Life Depended On It" written by FBI hostage negotiator Chris Voss. No first hand experience with the book but it's on my to-read list because of all the good recommendations.