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 , do you have a few moments when I could meet with you ?  
 Person2:I schedule my appointments from two to four on Saturday ; what works best for you ?  
 Person1:        Three would be a good time .  
 Person2:Great , do you need directions to my office ?  
 Person1:        I'm not sure .  
 Person2:Well , just make sure to go through the double doors , and I'll be on the right .  
 Person1:        OK , I'll find it .  
 Person2:It's very easy to find .  
 Person1:        See you then .  
 Person2:I will enjoy seeing you ; have a good week ! 

informal