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:       Tom has grown six inches within a year . 
 Person2:He has reached puberty . His mind and body both will change a lot . 
 Person1:        Yeah , do you see his Adam's apple ? It becomes bigger . 
 Person2:Time is flying . I still remember everything when he was a child . 

formal