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 need some flowers for my wife . It's her birthday .  
 Person2:Very well . We have some fresh red roses .  
 Person1:        How much are the roses ?  
 Person2:$ 20 per dozen .  
 Person1:        That sounds like a good deal .  
 Person2:Yes , they're on sale today .  
 Person1:        I'll take a dozen .  
 Person2:Splendid . Will there be anything else ?  
 Person1:        No , the roses will be fine .  
 Person2:I'm sure your wife will love them . 

informal