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:       Here's the dress you wanted it to be made .  
 Person2:Oh , dear !  
 Person1:        What's the matter ?  
 Person2:It's not what I asked for .  
 Person1:        What's wrong with it ?  
 Person2:It's not the right material . Or the right color . I can't possibly accept it .  
 Person1:        This is a pity ! 

informal