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:       What do you think of shopping ?  
 Person2:I don't mind shopping for food and other daily needs .  
 Person1:        What do you think of big department store ?  
 Person2:It's fun walking around them , but their displays are so good I'm tempted to buy things I don't really need . 

formal