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 know what , last night I almost got hit by a vase falling from the third floor .  
 Person2:Oh , how dreadful ! I ’ m ever so sorry .  
 Person1:        Luckily that was nothing serious .  
 Person2:Thank God ! 

informal