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:       You must be feeling terrible for Mary .  
 Person2:Yes , she's been like this for two weeks .  
 Person1:        I'm worried that she can't catch up with her class .  
 Person2:So am I.The doctor says she'll get over in a month . 

informal