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:       Mom , what are you doing ?  
 Person2:I'm clipping coupons .  
 Person1:        Still clipping coupons ?  
 Person2:It's a good way to save money .  
 Person1:        Saving money ? How much money can you save by those 1 or 2 dollar discount coupons ?  
 Person2:How much ? Last week I save $ 10 on food . 

formal