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:       Excuse me , Professor , is there a time when I could meet with you ?  
 Person2:I could meet with you tomorrow anywhere from two until four ; what time works out best ?  
 Person1:        I would like to come in at three o'clock .  
 Person2:I am glad that that works out ; can you find my office ?  
 Person1:        Yes , I can .  
 Person2:Just follow the walkway to the outside and climb the stairs to the third floor .  
 Person1:        I got it .  
 Person2:If you do get lost , just ask someone in the building to point the way .  
 Person1:        Thank you , I'll be there .  
 Person2:If you need to cancel your appointment , please give me a call ! 

formal