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 do you say to eating out , Maggie ?  
 Person2:Yeah , why not ? We haven't been out for dinner for quite a long time . A new French restaurant has just opened in our neighborhood . We can go there .  
 Person1:        Do we need to book a table in advance ?  
 Person2:No need for that . It's not usually busy on weekdays .  
 Person1:        What time shall we go ?  
 Person2:Why not now ? I'm hungry . 

informal