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:       I like your new skirt .  
 Person2:Do you think it fits me ?  
 Person1:        Yes . It looks terrific !  
 Person2:I bought it at half price .  
 Person1:        You were lucky to find it . 

informal