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:       This place is great . I'm surprised there are so many things here .  
 Person2:Yes , but it takes a while to find things . It's not organized as carefully as a regular store .  
 Person1:        What's the difference between an outlet and a regular store ?  
 Person2:Usually a clothes company will send their overstock to an outlet . The prices are very low . But you may find faulty products here too .  
 Person1:        Faulty products ?  
 Person2:Yes . Sometimes the fault is very small ; if you have a needle and thread , you can fix it yourself . So it's a good deal to buy it .  
 Person1:        Oh , that's easy for me . I think it's really a good deal .  
 Person2:Yes . You can save a lot of money in this way .  
 Person1:        That's great for me . Look , children's clothes ! I'd like to buy some winter clothes for my son and daughter .  
 Person2:Why not buy the sweater ? It only costs 30 Yuan .  
 Person1:        Yes , I'll take it . Are there any jeans ? Xiaohui's jeans are always dirty . I also need four pairs of slippers .  
 Person2:How many do you want to buy ?  
 Person1:        I ought to make the most of it while I'm here , don't you think ?  
 Person2:You're right . 

informal