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 , sir ? I just need a little bit more information . Could you tell me your telephone number and mailing address ?  
 Person2:Sure . My number is 545-8897 , and I live at 908 Mulbury Street .  
 Person1:        That ’ s 545-8897 and your mailing address is 908 Mulbury Street . The zip code is 20310 , right ?  
 Person2:That ’ s right . 

formal