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:       Hello , Rebecca , fancy meeting you here !  
 Person2:Hi , Paul . I haven't seen you for a long time .  
 Person1:        How have you been ?  
 Person2:Fine , thank you , and you ?  
 Person1:        Pretty good . What brings you here ?  
 Person2:I came to see my uncle . He lives in the next block . 

informal