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:       Ye Ting , who are these people in the picture ?  
 Person2:They're my family  
 Person1:        So you have two brothers ?  
 Person2:Yes , I'm the third child . 

formal