What is the purpose of a dialogue?
to broaden one's perspective
to win the argument
to prove a point
to be proven right

To broaden one's perspective

Explanation:

The main goal for dialogue is increase in understanding, question thoughts and actions, and to address any problems.

Example:

Kate is trying to tell her friends about a new aspect of technology she is working on. She will have a CONVERSATION with them and inform them of all the changes it will create. In turn, her friends are BROADENING THEIR PERSPECTIVE because they are learning new knowledge they may not have known before.

Hope this helps!