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 ring these up for me here ? 
 Person2:I would be happy to . Did you find everything you needed ? 
 Person1:        Yes , I did , thanks . 
 Person2:The total is 200 dollars . Would you like to put that on Sears card ? 
 Person1:        No , I'll pay for it in cash . 

informal