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:       You're right--Italian ! Ha ! Ha ! I was trying to trick you , but you didn't fall for it ! 
 Person2:I almost did ! Actually , I don't know that much about coffee , even though I sell it . 
 Person1:        I could give you a few pointers if you want . I know a lot about coffee . 
 Person2:Thanks . Maybe if things slow down later I'll stop by your table . 
 Person1:        I'm Robert , at your service . 
 Person2:Rita . Nice to meet you . 

informal