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 , sir . Is there anything I can help you find ? 
 Person2:Um ... Uh ... I'm just looking , thanks . 
 Person1:        Need a gift for your girlfriend or wife ? 
 Person2:No , no , no . I'm just browsing . Thanks anyway . 
 Person1:        Well , if you need anything , just ask . 
 Person2:Um ... well , where's the men's shoe department ? 
 Person1:        It's on the third floor . Turn left when you get off the escalator . 

informal