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 learned of the railway accident only this morning .  
 Person2:A really dreadful accident and many people were killed .  
 Person1:        Is that true ?  
 Person2:Yeah , well , I fill you in one the details later .  
 Person1:        Thanks . 

formal