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'.
Q:  Person1:       Did you pass the test ?  
 Person2:No , I didn't .  
 Person1:        I'm sorry to hear that . 
A: 
informal