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 have lots of friends .  
 Person2:Really ? How many do you have ?  
 Person1:        I don't know , maybe one hundred .  
 Person2:That is a lot of friends . Do you have a best friend ?  
 Person1:        Of course . I have lots of best friends .  
 Person2:How many best friends do you have ?  
 Person1:        I think about twenty-five .  
 Person2:Hmm . I have only one best friend .  
 Person1:        I feel sorry for you .  
 Person2:I have only a few friends .  
 Person1:        You must be lonely . I will share my friends with you .  
 Person2:That's very nice of you . 

informal