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:       Broadway Mall is having a big sale this weekend . You wanna go ?  
 Person2:Don't feel like it . I'm broke .  
 Person1:        Well , we can still do some window shopping , can't we ?  
 Person2:Just look around ? Ah , that's boring .  
 Person1:        I'll go myself then . 

informal