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:       Professor , could I make an appointment with you ?  
 Person2:I am free tomorrow afternoon between two and four ; do you have a particular time in mind ?  
 Person1:        Two o'clock would be the best time .  
 Person2:Fine , do you know where my office is ?  
 Person1:        No , I'm not sure .  
 Person2:Remember , it is in the E building on the third floor .  
 Person1:        I see .  
 Person2:Don't worry , it will work out fine once you get there . I'll see you then .  
 Person1:        I'll see you then .  
 Person2:Looking forward to meeting with you ! 

informal