Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Mrs . Smith , you are always worried about your children . 
 Person2:They are my own flesh and blood . It ’ s hard for me to see them suffering . 
 Person1:        That ’ s human nature . 

informal