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 , are cameras allowed here ? 
 Person2:Sorry , sir , in order to protect these paintings , taking photos are strictly forbidden here . 
 Person1:        I see . What a pity . I have to appreciate it carefully . 
 Person2:I am really sorry for that . 

informal