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 didn't come to work yesterday.What happened ?  
 Person2:I had to look after my son at home .  
 Person1:        What's wrong with him ?  
 Person2:He has a fever .  
 Person1:        Is he getting better now ?  
 Person2:I think so.Thank you . 

formal