Continuing repeating what they said word for word so they know you have heard

Observing the other person's non-verbal messages

Avoiding all eye contact or direct line of sight at all times. 

Staring into their eyes while they talk

Using your own verbal and non-verbal cues such as nodding, paraphrasing or sounds such as "uh ha" 

Acknowledging and avoiding any bias or assumptions about the person, their race, culture, gender or sexuality

Positioning your body towards the person at an appropriate cultural distance.