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:       When it comes to select a fund , you will always read “ Past performance is not an indication of future results ” , can you believe that ?  
 Person2:Maybe it is right since everything is possible . You know the market changes quickly these days . But I still have doubted those funds with bad stock performance . For me , his stock record is the very important criteria to decide which to buy . I really want to decrease the risk reach the minimum and achieve the maximum returns .  
 Person1:        But I still have doubted those funds with bad stock performance . For me , his stock record is the very important criteria to decide which to buy . I really want to decrease the risk reach the minimum and achieve the maximum returns .  
 Person2:If you refuse to take risk , you can ’ t have better returns .  
 Person1:        I will think about it . 

formal