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:       Is there anything I can dor you ? 
 Person2:Yes . I am looking for a restaurant with a cheerful atmosphere . 
 Person1:        Why not go the youth restaurant ? You will have a happy lunch there . 
 Person2:Well , thanks for your help . 

informal