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:       What's the matter ? You don't look well .  
 Person2:I am worried .  
 Person1:        What about ?  
 Person2:My exam .  
 Person1:        Oh , is that all ?  
 Person2:I feel very nervous about it .  
 Person1:        Don't worry about it . Try to look on the bright sight of things . 

informal