Diplomat dream to what you can manage to defeat a powerful enemy. If dreamed diplomat working in some exotic country, the reality means that you will succeed, many seem unacceptable.
I dreamed that you were your ambassador - then you will be not an easy task, execution of an important assignment.
Committed in a dream an important diplomatic trip - so, in the next few days there will be events that will for your life make a big difference.
If the dream as an ambassador for your friend, no relation to the profession, it means that a conflict has arisen between you resolved amicably.