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:       Bob !  
 Person2:Anne ! I haven't seen you for ages . How've you been ?  
 Person1:        Fine , just fine . And you ?  
 Person2:Not bad . It really is great to see you again . W here have you been ?  
 Person1:        Guangzhou . I've got a cousin there . 

informal