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 are the pop groups that you like ?  
 Person2:Oh , there are so many good ones ! I loved the Spice Girls . They were so cool !  
 Person1:        I agree ! I cried for a week when they broke up .  
 Person2:I was really sad too , but at least I can still listen to their Cds . 

informal