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:       Excuse me . How much for one are these ?  
 Person2:Un .. Those are 25 dollars each .  
 Person1:        OK . Say I was to buy four , could I get a discount ?  
 Person2:Well , I could offer you maybe 10 percent off .  
 Person1:        Oh , I was hoping to get one free . Like four for 75 dollars .  
 Person2:This one I'd better chat with the manager . Could you give me a second ? 

formal