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:       I am past my stop . Would you please let me get off ?  
 Person2:I am sorry . It's not allowed . You have to wait till the next station .  
 Person1:        Well , that's OK .  
 Person2:Can you please slow down ? I am not in a hurry .  
 Person1:        OK . 

informal