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:       What's going on here ?  
 Person2:We're waiting in line to get one of Master Li's Chinese couplets . I got one last year and I had good luck all year !  
 Person1:        Master Li ? Who's that ?  
 Person2:He's Taipei's most famous calligraphy master ! Quick ! Get in line !  
 Person1:        I will ! I could use some good luck ! 

informal