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:       Are you going to tell me about the stamp , or not ?  
 Person2:120 British pounds . But there are still three days left in the auction . If you want it , you'll have to bid . Do you have the guts ?  
 Person1:        I'm just asking . It's not like I'd actually make a bid .  
 Person2:Just don't come looking to me for help .  
 Person1:        Don't worry . I won't .  
 Person2:I'm signing off .  
 Person1:        Have fun getting ripped off ! 

formal