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:       Welcome , sir , what can I do for you ?  
 Person2:I want to buy some records .  
 Person1:        Whose record do you want ?  
 Person2:Are there the records of Michael Jackson ?  
 Person1:        His records have been sold out . The new copies will be available next week .  
 Person2:Oh . it's too late . Maybe I should go to other video stores to have a look . 

formal