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:       Can I help you , madam ?  
 Person2:Yes , can I see a few T-shirts , Please ?  
 Person1:        Certainly.Here you are.They ' re the very latest fashion .  
 Person2:I'm not very particular about the design.But I want something of good quality .  
 Person1:        They're of good cotton and the color never fades . 

informal