A solution may not be in sight but the important thing was to get a ___ between them started

"Dialogue" fits the sentence implying a formal exchange to address an issue aligning with seeking a solution. "Conflict" is counterproductive while "debate" and "conversation" are less formal. Vocabulary in context is useful in diplomatic or professional writing. Choosing "dialogue" ensures precision especially in negotiations or discussions. This skill is vital for resolving issues or fostering understanding in professional or academic settings where formal exchanges are key to effective communication and problem-solving.