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:       What can I do for you ?  
 Person2:Can I have a look at your handworks ?  
 Person1:        All right . This way , please .  
 Person2:You have quite a range , haven't you ?  
 Person1:        Yes , sir .  
 Person2:They are all produced in China , aren't they ?  
 Person1:        Yes , they are all distinctive Chinese .  
 Person2:Could you please select me one ?  
 Person1:        How do you like this one ? It's very beautiful .  
 Person2:Oh , I like it very much . How much does it cost ?  
 Person1:        350 yuan .  
 Person2:OK . I'll take it . 

informal