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:       What should I get Uncle Teddy ?  
 Person2:You could get him a tie .  
 Person1:        Are you kidding ? That's the stupidest gift one can buy . I don't want to get a tie .  
 Person2:Why not ?  
 Person1:        Everybody gets men ties for Christmas . It's too boring . Everybody buys either ties or sweaters . I want a more unique gift .  
 Person2:Well , you can buy him a pet iguana then .  
 Person1:        That's a cool idea . At least it would be a surprise.But I'm afraid he wouldn't take care of it .  
 Person2:He would think you were crazy , Caroline .  
 Person1:        Yes . An iguana is too strange for a gift , and a tie is too normal.So I have to find something halfway between .  
 Person2:How much do you want to spend ?  
 Person1:        Well , he was very good to me.He helped me edit my essay for the scholarship contest.So I want to spend at least 75 dollars .  
 Person2:Alright , I have an idea.You know he carries that conservative-looking briefcase every day .  
 Person1:        Yes .  
 Person2:Well , he isn't a lawyer , so I don't think he needs to have a briefcase like that .  
 Person1:        What should he have then ?  
 Person2:I think he would appreciate having a very fine leather bag.But more like a workbag or shoulder bag.You know , not so hard and square like a briefcase .  
 Person1:        I think that's a great idea . Men look great with that kind of bag.Where can we buy one ?  
 Person2:I don't think this mall has a leather goods store.So we have to go to State Street .  
 Person1:        Alright . We can go later then .  
 Person2:We can buy something for Mom and Dad here , and then go buy Uncle Teddy's gift on State Street .  
 Person1:        Good plan . What should we get for Mom though ?  
 Person2:She said she wants one of those automatic foot massagers . I think they sell them at Sears .  
 Person1:        Alright . We can go check at Sears and see if they have them.And what about Dad ?  
 Person2:How about the iguana ?  
 Person1:        I think it would be a great joke.But I know we'd have to take the iguana back . And the pet store might not let us.So why don't we get him something else ? Some clothes maybe .  
 Person2:A tie ?  
 Person1:        Oh , shut up about ties ! Forget about ties , why not ?  
 Person2:I was just kidding . 

informal