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:       What shall we do tonight ? 
 Person2:How about the cinema ? 
 Person1:        That's a good idea.We haven't been there for ages . 
 Person2:What would you suggest to see ? 
 Person1:        Oh , I don't know.It depends . 

informal