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'm looking for a gift for my daughter .  
 Person2:How about a laptop ?  
 Person1:        Yes , she needs something to help her at school .  
 Person2:How about a Mac ?  
 Person1:        That sounds good . How much is one ?  
 Person2:Our newest 15 - inch Pro is only $ 2,100 .  
 Person1:        Only $ 2,100 ? Okay , let me have one .  
 Person2:That's great . Will that be cash , check , or credit card ?  
 Person1:        Let me dig my VISA out of my purse .  
 Person2:Okay , if you'll just sign here , please .  
 Person1:        Do I need to buy anything else ?  
 Person2:All she has to do is open the box and follow the instructions .  
 Person1:        Thank you so much .  
 Person2:Thank you . If you have any problems , just call . 

informal