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:       Open your suitcase please .  
 Person2:Ok , here you are .  
 Person1:        Do you have anything do declare ?  
 Person2:No , I don't .  
 Person1:        Any cigarettes ? Baker ?  
 Person2:Yes , I have two cotton of cigarettes one bottle of whisky .  
 Person1:        What is the white powder ? Are they drugs ?  
 Person2:No , this is the medicine for the stomach .  
 Person1:        May I open one of those ? Let me taste it .  
 Person2:Yes , Sir , go ahead , here you are . 

formal