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:       Can you help me pick out a gift for my daughter ?  
 Person2:She might like a laptop computer .  
 Person1:        Yes , that sounds like a good idea .  
 Person2:Might I suggest a Mac ?  
 Person1:        Okay . How much ?  
 Person2:Well , a 15 - inch Pro is $ 2,100 .  
 Person1:        Oh , that sounds great . I'll take it .  
 Person2:Great . How would you like to pay for it ?  
 Person1:        Here's my VISA .  
 Person2:Let me ring you up . Okay , sign here , please .  
 Person1:        Everything I need is in this box ?  
 Person2:It'll take her only a few minutes to get online .  
 Person1:        Thank you for your help .  
 Person2:So long . Thank you for shopping here . 

informal