This doesn't mean you need to stay completely silent, but if you do interject, look for natural pauses to ask open-ended questions that benefit the speaker, not just your curiosity.
After the married women spoke about how hard it was to balance their lives, the single woman interjected that she was tired of people not taking her need to have a life seriously.
But Mr. Castro interjected that it was not sufficient to relieve only those seeking asylum from criminal penalty, because many of those charged for crossing the border illegally are " undocumented immigrants."
So you can do it by nodding and smiling and showing them that you're listening, but you can also interject with little words or little sounds like uh-huh, right, yeah, really.