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:       I'm looking for a white purse as a gift . Could you show what you have in stock ?  
 Person2:You are in luck . We just receive a shipment of several different styles of white purses .  
 Person1:        They must be popular again this season .  
 Person2:Yes , I believe they are . Here are something that might interest you .  
 Person1:        Wow . this is nice . I'll take this one . I guess if she doesn't like it she can return it , right ?  
 Person2:Sure . Let me ring this up for you at the register . If you would like , this can be gift-wrapped for free . Just take it to the customer service department . 

informal