It seems that there are 2 types of people you will encounter on an airplane. Those who never say a word to you, even though they sit next to you for hours, and those who don't know when to stop talking. I am not sure why there never seems to be anything in between. My ideal seat mate would say hello, answer my nosy questions about where they are from and where they are going, and then say nothing until farewell as we exit the plane. I don't actually want to hear your whole life story. I would like to be friendly for a few minutes, and then be left alone to sleep, read, or watch the movies I never get around to seeing at home.
Is that too much to ask?