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:       I want to know how to buy something from this machine .  
 Person2:Yeah , the new ones can be tricky . What are you trying to buy ?  
 Person1:        I want to buy one of those snack things .  
 Person2:Are you ready to go ?  
 Person1:        I'm clear so far .  
 Person2:The money goes in the slot over there . It has to be smooth to go in .  
 Person1:        It won't go in !  
 Person2:Just remember that you might have to feed the money in a couple of times to get it to work .  
 Person1:        Yes , next step .  
 Person2:Make your selection and hope for the best . Vending machines aren't all that reliable .  
 Person1:        They're totally unreliable .  
 Person2:You seem to have it down . Have a good day ! 

informal