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:       Look ! This picture of Mom in her cap and gown .  
 Person2:Isn't it lovely ! That's when she got her Master's Degree from Miami University .  
 Person1:        Yes , we are very proud of her .  
 Person2:Oh , that's a nice one of all of you together . Do you have the negative ? May I have a copy ?  
 Person1:        Surely , I'll have one made for you . You want a print ?  
 Person2:No . I'd like a slide , I have a new projector .  
 Person1:        I'd like to see that myself .  
 Person2:Have a wallet size print made for me , too .  
 Person1:        Certainly . 

informal