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:       Do you like plum blossoms ?  
 Person2:Certainly . I prefer the winter and I love plum blossoms much more .  
 Person1:        It's snowing heavily . What about taking a walk ?  
 Person2:Seeking plum blossoms with stepping on the snow ? That's a good idea . Let's go !  
 Person1:        What a heavy snow !  
 Person2:Take care ! Don't slip down to the ground .  
 Person1:        I've got it . I like the sound of stepping on the snow very much .  
 Person2:Yes . Very wonderful .  
 Person1:        Do you smell the sweet scent ?  
 Person2:Yes . It should be the fragrance of plum blossoms .  
 Person1:        The fragrance of plum blossoms comes from the hard coldness . 

informal