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:       Would you show me some table-cloths ?  
 Person2:Certainly . ( Take a table-cloth to her )  
 Person1:        How much is it ?  
 Person2:A table-cloth of this size and style is 15 Yuan .  
 Person1:        That ’ s reasonable .  
 Person2:If you take good care of it , it will last you quite a number of years .  
 Person1:        Really ? I ’ ll take it then . 

informal