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:       How much is it ?  
 Person2:6 500 yuan . You will get it on the price tag .  
 Person1:        It s a little overpriced . Is there any discount on this laptop ?  
 Person2:Its already very cheap . Let's make it 6 000 yuan .  
 Person1:        I ’ d buy this if it were cheaper . How about 5 000 yuan ?  
 Person2:Hum ... I say 5 500 yuan . That's as cheap as it can get .  
 Person1:        Is it the final price ?  
 Person2:I'm sorry , this is our rock bottom price .  
 Person1:        Alright , I ’ ll buy this one . 

informal