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:       Don't just stand outside . Come on in . 
 Person2:Yeah . 
 Person1:        This is Alex . Remember ? This is Sean . 
 Person2:Nice to meet you guys . 
 Person1:        Over there are Stacy and Rebecca . We're all on the school's tennis team . 
 Person2:Who's that guy who's handing out beer to everyone ? 
 Person1:        That's my boyfriend Matt . Isn't he cute ? 
 Person2:He sure is ! 
 Person1:        Come on . I'll introduce you two . 

informal