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:       Mary ! I haven ’ t seen you since our dinner with Mr . Lee last week . Where have you been hiding yourself lately ?  
 Person2:Oh , hi Mike . I ’ Ve been out of town the last few days . What did you need ?  
 Person1:        Really , nothing big . I just heard about your ideas on employee motivation and I wanted chat with you about a few things going on in my department .  
 Person2:Well , feel free to drop by my office any time . The door ’ s always open .  
 Person1:        Actually , I was hoping to mix business with pleasure . Would you be interested in joining me for dinner some time this week ? I thought we might try out the new Italian restaurant everyone ’ s been  
 Person2:Sure , Mike , I ’ d love to .  
 Person1:        Is this evening too soon ?  
 Person2:No , that ’ s perfect . We can leave directly from here . 

informal