Many people are offended however, by not being recognized in broad daylight by someone who is obviously not completely blind. Because of that, this approach works best with people who know that you are face-blind. Most people would use this at a masquerade. If you have arranged to meet a person in a certain place and at a certain time, and you find someone in that spot who looks approximately like that person, it probably is that person. Most people would use this method to find someone they have only seen a small photo of.
People tend to speak about things they have talked about before.
If someone appears to continue a previous discussion, it is probably the same person that you had this discussion with last time. Sound of voice. Many people would use this in combination with the previous when someone does not introduce himself or herself when talking on the telephone. If you can not use the face for identification, there is really very little else you can see of a person that you meet. Clothes usually cover everything except the head and the hands.