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:       Don't you think it's nice out ?  
 Person2:Yes , I think so too .  
 Person1:        I think that it's going to rain .  
 Person2:I hope that it does rain .  
 Person1:        You like the rain ?  
 Person2:The sky looks so clean after it rains . I love it .  
 Person1:        I understand . Rain does make it smell cleaner .  
 Person2:I love most how it is at night after it rains .  
 Person1:        How come ?  
 Person2:You can see the stars so much more clearly after it rains .  
 Person1:        I would love for it to rain today .  
 Person2:I would too . 

formal