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:       Mary , Pam and I are going to the mall later to buy some new clothes . Do you want to come ?  
 Person2:Can you say it again slowly ?  
 Person1:        Pam and I are wondering if you'd like to go to the mall with us .  
 Person2:Oh , I see . I'll have to sink about it .  
 Person1:        Sink ?  
 Person2:Oops . I meant , " think "  
 Person1:        Mary , you're going to have to work on your pronunciation .  
 Person2:I know .  
 Person1:        But give yourself some time . You just got here . 

formal