It may feel unnatural at first, but is totally okay to repeat or summarize what you heard the other person say, without adding any own interpretation. You will notice that they will actually enjoy it! It means you are truly interested in hearing them.
Similarly, you can ask them to summarize what they heard you say. You may be surprised at how often they will repeat what you told them, only for you to notice that what you actually wanted them to hear is something else than what you said!