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:       We're going out to dinner and then to the movies .  
 Person2:Hold on ! I can't afford to pay for both .  
 Person1:        Don't worry . I've got money . It's my treat .  
 Person2:Gee , that's really nice of you . 

informal