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 feel better ?  
 Person2:Much better . My heart sank when Mary told me that she wanted to leave me .  
 Person1:        Don ’ t be sad . Everything will be fine .  
 Person2:Thanks a lot . You are so kind . 

informal