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:       It's the 17th week now , isn't it ?  
 Person2:Yes , it is .  
 Person1:        Oh , the final exam is coming soon . I feel a little bit nervous .  
 Person2:Take it easy . There is still one more week left before the exam begins . Have you prepared for it well ?  
 Person1:        No , I haven't began my preparations .  
 Person2:Then shall we make preparations together ?  
 Person1:        Great . You can help me a lot with English .  
 Person2:All right . But I am very poor at math . Would you like to help me with my math ?  
 Person1:        No problem . 

informal