negotiation discussion

After reading the Holly Weeks article in Readings 2.6 (p. 183) and the reading assignment "This Year, Say Yes to Saying No" (also attached here), describe a situation at work (either real or potentially possible), where you had to say no to a colleague or subordinate on an issue that meant a great deal to them (salary, responsibilities, requests etc.). Did you stay with no? How did it play out? Is the author's advice helpful?  

At least 200 words and 1 reference, please answer the question after reading and on time!!!!!