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:       Let me suggest this one . It's an excellent watch , it looks good , and it's only $ 100 .  
 Person2:Hmm . That's not too bad . Does it have a stopwatch ?  
 Person1:        Uh , no . Analog watches don't come with stopwatches . You'll have to get a digital if you want a stopwatch .  
 Person2:Oh . I see . Where are your digital watches ?  
 Person1:        Right here .  
 Person2:I don't like this kind as much . Never mind the stopwatch then . I'll take that other one . Do you take checks ?  
 Person1:        Yes . Make it out to Time After Time .  
 Person2:Here you are .  
 Person1:        Thank you . 

informal