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:       Do you know where Helen is ?  
 Person2:She's gone to a flower shop . Today is her husband's birthday .  
 Person1:        That reminds me . My wedding anniversary is tomorrow . 

formal