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:       Does he know that he has already at his wits ' end ?  
 Person2:I think he has realized that . But he is still whistling in the dark by putting up an act .  
 Person1:        He might be driven up a wall . You should not handle your relation with him with kid gloves .  
 Person2:But when I noticed that he was left in the cold , I could not help wanting to help him to get out of the situation . 

formal