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 mind helping me ? 
 Person2:What can I help you with ? 
 Person1:        I'm not sure how to find my next class . 
 Person2:Do you know what building that it's in ? 
 Person1:        The C building , I think . 
 Person2:Well , that's not far away . 
 Person1:        Could you point me in that direction ? 
 Person2:Do you know what the room number is ? 
 Person1:        It's C261 . 
 Person2:My next class is around there . 
 Person1:        Can you show it to me ? 
 Person2:Sure , let's go . 

formal