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:       Do you have wool socks ? 
 Person2:Yes . We have socks made of various materials . These socks are of imported wool . 
 Person1:        Can you guarantee the quality ? 
 Person2:Yes , absolutely . 
 Person1:        Where are the panty-hose ? 
 Person2:Here . We have black , white and transparent panty-hose here . 

formal