Whereas while taking an appointment, it is plausible the need to annotate the name of the doctor, in a social call with a friend, the name of the friend is part of the background knowledge of the user.
while from a content (and an NLP) point of view both names are Person NEs and carry the same amount of information, from the point of view of the user they might have different weight (no need of taking note vs need of taking note).