Keep in mind there are those situations where an effective solution involves walking away from the problem. With this choice, you may need to acknowledge that you cannot always make work flow at an even, pleasant rate, but you can learn to relax amid stress. Schedule an adequate amount of uninterrupted time in a non-threatening place away from the work environment for a meeting. It is necessary to deal with emotions, as well as behavior. Unmet needs are always the most important needs at any given moment .
People resist change.
Most agreements involve asking for change, yet change threatens the most basic of instincts, survival. Cooperation flows from respect. Poor working relationships exist when there is a lack of trust, support and respect. Even when you disagree, you can still respect the other person. Look for something positive in that person and build on that.