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:       Excuse me , I'm looking for your casual short-sleeved shirts . Can you tell me where those are ?  
 Person2:Right over here , sir . What size do you wear ?  
 Person1:        Medium .  
 Person2:These here are all mediums .  
 Person1:        Thank you . I think I'll take this one , and these pants as well . They're a present for a friend .  
 Person2:Shall I gift-wrap them for you , sir ?  
 Person1:        Yes , please . 

informal