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 flowers ?  
 Person2:Of course , I like .  
 Person1:        What's your favorite flower ?  
 Person2:Forsythia . It's also called winter jasmine which is the symbol of the spring's arrival .  
 Person1:        Spring is a lively season .  
 Person2:Yes . How about you ?  
 Person1:        I admire plum blossoms very much . It seems that only it can blossom in the cold winter .  
 Person2:You have a perfect taste !  
 Person1:        It is the symbol of laughing at hoar frost and fighting with snow . I admire the bravery of plum blossoms .  
 Person2:But it used to be ignored by many people .  
 Person1:        The bright people will remember it forever .  
 Person2:Well , it's snowing . Let's enjoy the plum blossoms when snowing . 

informal