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:       Is there anything I can do for you ? 
 Person2:Yes , I'd like to buy a color TV . 
 Person1:        We carry products from three large manufacturers and some imported ones , too . Do you have a specific model in mind ? 
 Person2:No . Which one do you recommend ? 
 Person1:        This one from Sony gives a very sharp picture . 
 Person2:Thank you , but I'd prefer to buy a China-made set . 
 Person1:        Which brand do you prefer ? 
 Person2:Sky worth . 
 Person1:        OK . Come with me , please . 

formal