Q: 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'.
 Person1:       Hi . Can I help you ?  
 Person2:No , thanks . I ’ m just looking around .  
 Person1:        Okay . Please let me know if you need any help .  
 Person2:Thanks a lot . 
A:
informal