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:       So do you think you can get to the office alone ?  
 Person2:Sure , I ’ ll catch the train . If I can ’ t catch the train , I ’ ll get a taxi .  
 Person1:        Do you think the taxi driver will understand you ?  
 Person2:If he doesn ’ t understand me , I ’ ll show him the office address on my business card .  
 Person1:        Ok but how will we know if you are going to be late ?  
 Person2:I ’ ll call you if I ’ m delayed . 

formal