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:       My mascara's waterproof !  
 Person2:Oh , how high class ! So you just wear it forever ?  
 Person1:        No . There's makeup remover for waterproof mascara .  
 Person2:Is it dry yet ?  
 Person1:        Yep . See how long and curly my lashes are ?  
 Person2:They look fake .  
 Person1:        Thanks ! 

informal