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:       Come in and have some coffee , Anna . The kids have just gone out to the mall to hang out with their friends .  
 Person2:I saw a lot of teenagers when Alan and I were there yesterday .  
 Person1:        They spend hours there , especially on weekends .  
 Person2:Speaking of that trip , Alan bought a shirt at a department store , but the sleeves are too long . Do you know a seamstress or tailor who can shorten them ?  
 Person1:        I know several . But wouldn ’ t it be easier to take the shirt back and exchange it for the right size ?  
 Person2:Isn ’ t that complicated ?  
 Person1:        No , it ’ s easy . We ’ ll just take the shirt back to the men ’ s department and show them the sales slip . They ’ ll exchange it for the correct size or give you a refund .  
 Person2:We ? Do you want to go with me ?  
 Person1:        Sure . I love going to the mall .  
 Person2:What do you do there ... hang around , like the kids ? 

formal