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:       Do you like cooking ?  
 Person2:Yes . I like cooking very much . I got this hobby when I was 12 years sold .  
 Person1:        Why do you like it ?  
 Person2:I have no idea . I like cooking by myself . I like to taste delicious food .  
 Person1:        That's wonderful !  
 Person2:And I love trying new recipes , which I usually test with my friends . You can come , too .  
 Person1:        Really ? I hope I can have a chance to taste it . Don't forget to tell me .  
 Person2:Certainly . 

informal