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:       Hi , Li Ming . You look upset . What's the matter ?  
 Person2:There will be a parents ' meeting in our class this Saturday and I am worried about it .  
 Person1:        Why ? We can leave school earlier that day .  
 Person2:I didn't do well in last exams . If my father knows it , he will beat me up .  
 Person1:        I can't believe it . My parents never beat me .  
 Person2:You know that my father is irritable .  
 Person1:        You can ask the teacher for help .  
 Person2:Good idea . 

informal