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:       Boy ! What a beauty ! I fall in love with her at the first sight .  
 Person2:The beauty under the tree ?  
 Person1:        Of course.No girl is more charming .  
 Person2:She is a young man ! 

informal