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:       Is anybody here ?  
 Person2:Coming . What do you want today ?  
 Person1:        Quite a lot . I need one pound of potatoes , three pints of milk , a dozen eggs and one pound of tomatoes .  
 Person2:Our fruit is very fresh today . Do you want some ?  
 Person1:        How much are the lemons ?  
 Person2:Three for ten cents .  
 Person1:        Give me a dozen lemons .  
 Person2:Anything else ?  
 Person1:        No , thanks . How much in total ?  
 Person2:Twenty eight dollars . 

formal