Instructions: 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 look tired . 
 Person2:Yeah , I've been working so much overtime lately . 
 Person1:        Really ? How come ? 
 Person2:My boss gave me a big project . I had to have it finished by this morning . It was so difficult . 
 Person1:        You shouldn't work so hard . 
 Person2:I know , but hard work pays off . You know . 
 Person1:        What do you mean ? 
 Person2:Maybe now I'll get that promotion I was hoping for . 
Output:
informal