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:       I haven't seen Bill lately . How is he ?  
 Person2:He's still pretty sick .  
 Person1:        That's too bad . What does he have ?  
 Person2:We don't know , but he's going to the doctor tomorrow .  
 Person1:        Let me know if there's anything I can do .  
 Person2:Thanks a lot . I'll tell him . 

informal