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:       Have a nice weekend !  
 Person2:Thanks.You too !  
 Person1:        Do you have any plans ?  
 Person2:Well , my family's away and I can't afford to do much.What about you ?  
 Person1:        Oh , I haven't decided what I'm going to do yet . 

informal