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:       Isn't it a nice day ?  
 Person2:It really is .  
 Person1:        It seems that it may rain today .  
 Person2:Hopefully it will .  
 Person1:        How come ?  
 Person2:I like how clear the sky gets after it rains .  
 Person1:        I feel the same way . It smells so good after it rains .  
 Person2:I especially love the night air when it rains .  
 Person1:        Really ? Why ?  
 Person2:The stars look so much closer after it rains .  
 Person1:        I really want it to rain today .  
 Person2:Yeah , so do I . 

formal