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:       Joanna , I will go to the outlet center . You wanna go with me ?  
 Person2:It's so faraway .  
 Person1:        I saw Emily yesterday evening . She was wearing a CD evening gown . She told me she bought it in the outlet center and she saved $ 120 !  
 Person2:$ 120 ? ! Then I should go and see what I can get ... 

informal