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:       Hey , your Chinese is coming along !  
 Person2:You think ?  
 Person1:        Yeah . It ’ s a lot better than mine .  
 Person2:But I still get stuck on the different tones . It drives me crazy .  
 Person1:        Hang in there . It ’ ll all come together one of these days . 

informal