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 have any habits such as smoking ?  
 Person2:No , I rarely smoke . I don't drink , either . I only drink with my family on celebrations or with close friends .  
 Person1:        What kind of winter sport do you like best ?  
 Person2:My favorite winter sport is skiing . In addition , I am keen on basketball .  
 Person1:        What do you like doing in your spare time ?  
 Person2:I like doing aerobics in my spare time . It's good for my health .  
 Person1:        Do you have any hobbies ?  
 Person2:Yes , I have . I collect stamps , Chinese stamps as well as those from other countries . 

formal