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 all set now ?  
 Person2:Oh , thank you so much .  
 Person1:        Really , it was nothing .  
 Person2:I really appreciated it .  
 Person1:        I was happy to help .  
 Person2:It was so kind of you .  
 Person1:        Don ’ t mention it .  
 Person2:You ’ re a real friend in need . 

informal