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 was that ?  
 Person2:Oh no . I broke your vase accidentally .  
 Person1:        How did it happen ?  
 Person2:I bumped it by accident , but I didn't mean to do it .  
 Person1:        It was my favorite .  
 Person2:I feel miserable . Can I give you money for it ?  
 Person1:        Maybe I shouldn't have put it here . Someone was bound to bump it eventually .  
 Person2:First I was late for school this morning , and now I broke your vase . This isn't my day ! 

informal