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:       That was a great dinner . I didn't know that you knew how yo cook .  
 Person2:I'm glad you liked it . Are you ready for dessert ?  
 Person1:        I don't know . I'm pretty full . What are we having ?  
 Person2:I made strawberry shortcake .  
 Person1:        Ooh , that's my favorite . Maybe I'll have a small slice .  
 Person2:Great . Would you like coffee or tea with that ?  
 Person1:        I'll have a cup of tea .  
 Person2:Do you take cream or sugar with your tea ?  
 Person1:        Actually , could I have some milk with that ?  
 Person2:Definitely . Would you like skim or whole milk ?  
 Person1:        Skim , please . That'd be very nice . Thanks ... oh no . Janna , I'm so sorry , but I've got to go .  
 Person2:What happened ?  
 Person1:        I just got a message from my sister saying that she's been in a car accident . I need to go pick her up .  
 Person2:I'll go with you . Where is she ?  
 Person1:        She's on the M40 , near Reading .  
 Person2:Is she alright ?  
 Person1:        I don't know , she didn't say . I'm so sorry about this .  
 Person2:Don't worry . Family comes first . Come on , let's go .  
 Person1:        Actually , I've only got a two-seater . I'll have to go on my own .  
 Person2:Ok . Just call me if you need anything then .  
 Person1:        I will . Thanks a lot . 

informal