Pay attention to the speaker, not your own thoughts.
Devote your whole attention to the speaker. Being mindful means being present in the moment and paying attention to what is happening right now. In a conversation, this means observing the speaker while they are sharing their story.
Be aware of subtle changes in their voice, the way they mimic you, the words they use and the emotions they are experiencing. Try to truly understand the thought process of your conversation partner.
Observe your own thoughts, but from a distance, and resist the temptation to engage in them.
*Taken from https://positivepsychology.com/active-listening/ click link to read more.