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 , would you like to go dance with us tonight ? 
 Person2:John , I am just not in the mood for this . 
 Person1:        You look so upset . What's going on ? 
 Person2:I lost the table tennis game yesterday . 
 Person1:        Oh , what a pity ! 
 Person2:I just don ’ t want to play table tennis any more . 
 Person1:        Is it that bad ? It ’ s nothing more than a game . 
 Person2:My opponent bowled me with the very first ball . I was wondering if it's appropriate for me to play table tennis . 
 Person1:        Oh , come on ! Failure is the mother of success . Don ’ t lose heart . I'm sure you'll succeed . 
 Person2:Perhaps you are right . But I still need some time to recover from the failure . 
 Person1:        I understand . 

informal