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 . In this museum , you are not supposed to take pictures .  
 Person2:Is that right ? I didn't know it .  
 Person1:        Will you give me your camera ? We have to confiscate your film .  
 Person2:Will you forgive me . Could you return my camera ?  
 Person1:        We will keep and return it later .  
 Person2:Oh , I see . Then , can I buy slides and picture postcards somewhere ?  
 Person1:        You can buy them at the souvenir shop near the exit . 

formal