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:       What do you like to do in your spare time ?  
 Person2:I like playing chess .  
 Person1:        Do you have any hobbies besides playing chess ?  
 Person2:I'm afraid not .  
 Person1:        Do you have any hobbies like playing tennis or things like that ?  
 Person2:Oh , yes . I like playing basketball .  
 Person1:        Can you tell me why you like it ?  
 Person2:Because I like the feeling of cooperating with others . 

formal