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:       Your total comes to $ 36.78 .  
 Person2:Put it on my VISA .  
 Person1:        There ’ s a problem with your card .  
 Person2:What ’ s wrong with it ?  
 Person1:        I believe it was declined .  
 Person2:You ’ re kidding me !  
 Person1:        Do you have another card I could try ?  
 Person2:I only have one card .  
 Person1:        Do you have cash , perhaps ?  
 Person2:I don ’ t have any cash on me .  
 Person1:        You ’ re not going to be able to take these items today .  
 Person2:I ’ ll be back tomorrow . 

informal