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:       Who broke the glass , Peter ? 
 Person2:That cat . 
 Person1:        I was not born yesterday . It must be either you or Adam . 
 Person2:It ’ s me , mum , I am sorry . 

formal