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:       Hi , Ann .  
 Person2:Hi . You look excited . What's happening ?  
 Person1:        I just heard that our school will hold a singing contest in 5 days .  
 Person2:And you're planning to enter ?  
 Person1:        Of course . This is a great chance for me to show off my beautiful voice .  
 Person2:Is there a prize ?  
 Person1:        I heard that the winner gets a Panda Radio .  
 Person2:Do you think you have a chance ?  
 Person1:        A chance ? Not just a chance , I'm a hundred percent certain.Everyone says my voice is beautiful .  
 Person2:But you haven't practised all that much .  
 Person1:        I still have 5 days to practise . It's in the bag !  
 Person2:Don't be too sure . You're still going to need some help .  
 Person1:        Yeah , maybe . 

informal