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:       Wow ! Look at the time . lt's about 11 0 ' clock .  
 Person2:Really ? I didn't realize it was so late .  
 Person1:        I've got to catch the last bus . See you later . 

informal