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:       Did you happen to bring that book that we were talking about yesterday ?  
 Person2:I did . Let me go get it for you . Here you go .  
 Person1:        Thanks so much .  
 Person2:I like the way that the gifts I get increasingly more lavish .  
 Person1:        I had no idea that there were specific things that should be given on different anniversaries .  
 Person2:So what does it say you should give your wife this first anniversary ?  
 Person1:        It says that traditionally , give something made of paper .  
 Person2:I can think of two things made of paper — stationery and money . 

informal