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:       Hello , Pam .  
 Person2:I'm glad that you can make it .  
 Person1:        It looks like there are a lot of people inside .  
 Person2:Yeah . I've invited a lot of friends besides you .  
 Person1:        Should I take my shoes off ?  
 Person2:We all keep our shoes on indoors .  
 Person1:        Where are your parents ?  
 Person2:They've gone out so that we could have the house to ourselves .  
 Person1:        That's great ! 

informal