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:       Did you hear that Mary ’ s marriage is on the rocks ? 
 Person2:So I hear . 
 Person1:        Yesterday I met Mary , and she told me her husband often made pass at his secretary . 
 Person2:After all the crises they have survived together , her husband should do such things . She must feel that she ’ s been stabbed in the back . 

formal