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:       Today more and more families have personal computers . People have wider range of choice to communicate with the outside world .  
 Person2:Right . With the establishment of Internet and a lot of web companies , people are getting more and more dependent on the web .  
 Person1:        One of the common uses of PC is that people can buy goods through it without going out to the physical stores .  
 Person2:Can you tell me how it is done ?  
 Person1:        If a customer is interested in some certain goods , he can ask the web company to have the specimen of the goods shown on the color screen , and then the customer can place an order online to the sales company . And then the goods you want will be delivered to your home . The service is perfect and the delivery is free of charge .  
 Person2:I see . So great . 

informal