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 Rose , what are you busy with right now ?  
 Person2:Hi Jack , I'm working on these documents . The manager wants them for half an hour .  
 Person1:        Well , Rose .  
 Person2:Is there something any need ?  
 Person1:        Are your free this weekend ?  
 Person2:Yes , I have nothing to do .  
 Person1:        Great , Is it convenient if i visit you this weekend ?  
 Person2:I beg your pardon ?  
 Person1:        I'd like to call on you this weekend . I just want to a drop in for a chat .  
 Person2:Really ? well , ok , you're welcome .  
 Person1:        Is 5 PM . Saturday a good time for you ?  
 Person2:Hmm , how about seven ? I can treat you to dinner .  
 Person1:        Sure , that would be great . I'll bring the wine .  
 Person2:OK . Then I'll be expecting you .  
 Person1:        I'll be there on time . 

informal