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:       Look out ! Your tea water is running over .  
 Person2:Oh , would you please turn off the fire ? My hands are sticky with the dough .  
 Person1:        Sure .  
 Person2:Thanks . 

informal