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:       Hi , Jenny . Are still working ?  
 Person2:Hi , Nancy . Come in please . I'm just putting away on my books .  
 Person1:        So , you are leaving , aren't you ?  
 Person2:Yes , I ’ m going to take a holiday tomorrow .  
 Person1:        How nice ! I can see you are busying packing . I'm sorry to interrupt you .  
 Person2:That's all right . I'm almost finished . Do you need my help ?  
 Person1:        Yes , could you please go over this for me ? And see if there is any mistake in it ?  
 Person2:Oh . All right I'll read it soon .  
 Person1:        Excuse me for taking your time .  
 Person2:It's nothing Nancy . 

informal