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:       Your husband is very helpful , isn't he ? 
 Person2:Willing to help , maybe , but not as helpful as you think . 
 Person1:        Really ? 
 Person2:Last night he told the children a cliff-hanger story and both of them were scared out of sleep . 

informal