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 need help with something ?  
 Person2:I need help finding a new refrigerator .  
 Person1:        Do you see anything that you like ?  
 Person2:That Kenmore looks nice .  
 Person1:        That is a wonderful choice .  
 Person2:What makes is so great ?  
 Person1:        It's very inexpensive , and it has all the appliances .  
 Person2:What appliances are you talking about ?  
 Person1:        The fridge and freezer is very spacious , and it also has an ice maker and water dispenser .  
 Person2:May I take a look inside ?  
 Person1:        Take a look inside .  
 Person2:It's very nice . I'd like to purchase this refrigerator . 

informal