The first words

You see somone on waking
perhaps they say something
and you say something.
Those first words are the starting point for the day.
I wonder if you can tell how the day will go just from those words.
Were the words angry or loving?
Were the words a complaint or a compliment?
Were they words serious or lightly joking, teasing and meaningless?
Are those words like the color of the sky in the morning that can predict the weather of the day to come?
As the proverb goes,
"Red sky in the morning, sailor's warning. Red sky at night, sailor's delight."
What words might be a "Red sky in the morning?"