Two women are laughing and smiling while they eat a meal together.
Lilly and Sally were laughing while eating lunch.
Not all women are named lilly or sally. Just because they where eating a meal together does not mean that they were eating lunch.
There is no way to know their names are Lilly and Sally. A meal is not always lunch.
Two women does not means that their names are Lilly and Sally.  Eating a meal does not mean that the meal is lunch.