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:       What day is today ?  
 Person2:Today is Thursday .  
 Person1:        What's the date today ?  
 Person2:Today is May first , 2003 .  
 Person1:        Oh , today's International Labour Day . Is it our working day ?  
 Person2:Well , I don't think so . 

formal