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:       Long time no see !  
 Person2:Yes . It has been a long time since the last time we met .  
 Person1:        It's nice to see you again . Have you changed jobs ?  
 Person2:No . I've been visiting relatives recently .  
 Person1:        That's nice . Where have you been ?  
 Person2:I went to visit an uncle in San Francisco .  
 Person1:        Are you busy now ?  
 Person2:No . Why ?  
 Person1:        How about a coffee in that cafe ?  
 Person2:Great . Let's talk over coffee . 

formal