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:       Are you ok , Chuck ? You look pale .  
 Person2:I'm fine , Katherine . I just stayed up late last night working on my Chinese .  
 Person1:        Oh , poor you . You know what ? I found a new way to learn Chinese and it works very well .  
 Person2:You did ? Do tell me . I've spent all these months trying to learn something new about it , but I've made little progress !  
 Person1:        Sure . I'm learning Chinese through songs .  
 Person2:So you're learning Chinese songs ?  
 Person1:        You can say that . I can actually sing some of them now .  
 Person2:That's a real achievement . How did you do that ?  
 Person1:        I start by listening to the song a few times and after several times I am able to follow the singer .  
 Person2:It makes sense .  
 Person1:        It does . I've learned some Chinese folk songs this way . They are clearly presented and easy to follow .  
 Person2:Can Join you , Katherine ? I do want to have a try .  
 Person1:        Why not ? I downloaded a beautiful song the other day . We can learn it together now .  
 Person2:Great . Do you think we need a Chinese dictionary ?  
 Person1:        Yes , just in case we run into me new characters .  
 Person2:Ok . I will bring it with me . 

formal