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:       Welcome , Ron , come on in !  
 Person2:Hi , Malia ! What a nice home !  
 Person1:        We enjoy it too !  
 Person2:How long have you lived here ?  
 Person1:        About four years now .  
 Person2:Well , it is very beautiful .  
 Person1:        Ron , have a seat and I'll get us something to drink .  
 Person2:Good ! I am really thirsty . You know it really is hot outside !  
 Person1:        I have lemonade , iced tea , and mango juice .  
 Person2:Mango juice would be perfect . Thank you ! 

informal