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:       Steven , have you ever met Hanson ever since he went back to London ?  
 Person2:No , but we still stay in touch .  
 Person1:        What's the way you keep in contact ?  
 Person2:We contact through email .  
 Person1:        Email is not always the best form . I think QQ is way better .  
 Person2:Your words sound a bit reasonable . But don ’ t forget the time difference .  
 Person1:        You're right . 

formal