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:       Mary didn't pass the final exam in physics .  
 Person2:She must be very sad .  
 Person1:        Her parents scolded her severely and she's very depressed now .  
 Person2:At a time like this , what she needs is a pat on the back rather than a blame . 

informal