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:       I ’ Ve got this really neat idea , you can hire a car and drive straight there .  
 Person2:Are you nuts ? What would my friends think if they see me in a hired car ?  
 Person1:        But that ’ s the quickest way to make your plans work .  
 Person2:Oh this is hard ! Well , I ’ ll see what I can do . 

informal