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:       Ernie , I'm really excited about starting this band together . We're going to be the two coolest students on campus . 
 Person2:I know ! It's gonna be great . But what kind of music do you think we should play ? 
 Person1:        That's a good question . You know I love hip hop , so maybe we can play some Vanilla Ice songs . 
 Person2:Hmm ... Vanilla Ice ? I know his most famous song , " Ice Ice Baby , " but I don't know his other songs . 
 Person1:        That's OK . You can buy his songs on iTunes and listen to them . 

informal