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:       I just had a terrible week .  
 Person2:what a shame !  
 Person1:        I fell down and hurt my arm .  
 Person2:That's too bad .  
 Person1:        Then my son drove into a tree .  
 Person2:I am sorry to hear that .  
 Person1:        The dog bit the delivery boy .  
 Person2:What a pity !  
 Person1:        And a storm blew our roof away .  
 Person2:Ho , no ! 

informal