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 want to hear a funny joke ? 
 Person2:OK . Are you sure it's funny , though ? 
 Person1:        Well , you'll see . 
 Person2:OK . 
 Person1:        OK , an Englishman , a Scotsman , and an Irishman were going on a trip across the desert , and they could only take one thing with them . 
 Person2:I see . 
 Person1:        So they met up at the start of the journey and showed each other their equipment . 
 Person2:Oh , that's funny ! 
 Person1:        Hang on , I haven't finished yet . 
 Person2:Oh , sorry . 
 Person1:        Well , as I was saying , they showed each other what they had decided to bring . The Englishman had brought some water . " If we get thirsty , we'll have something to drink , " he said . The Scotsman brought a map . " If we get lost , we'll be able to find our way . " The Irishman had brought a car door . 
 Person2:A car door ? You mean just one car door ? 
 Person1:        Yep . A car door . " Why the door ? " the others asked him . " Well , " he said , “ If it gets hot , we can open the window . " Do you get it ? 
 Person2:Well ... 

informal