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 know that Mary ’ s marriage is on the rocks ? 
 Person2:Really ? I ’ Ve never heard of it ! 
 Person1:        I saw her husband have it out with her yesterday . 
 Person2:I think Mary must be sad , because she loves her husband very much . 

informal