If you dream that you come to an agreement with someone else, it can be a message from your unconscious that you can find a solution to a problem that you have in waking life.
The person that you come to the agreement with could represent a quality in yourself that you must access in order to find the solution.
If you dream that you have a dispute with someone else, and that you and that person cannot come to an agreement, your unconscious may be trying to tell you that a choice that you have made could have negative consequences.
Dreaming that you help two people or two groups of people come to an agreement can mean that you feel that you need to take charge of a situation.