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:       Jenny , I want to go on a picnic . Could you come too ?  
 Person2:I'd be glad to . I love picnicking .  
 Person1:        Then , put on your casual clothes and pack some food and beverages .  
 Person2:Can I bring my camera with me ?  
 Person1:        Sure . Bring enough films , please .  
 Person2:I sure will . 

informal