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:       How are you making out ?  
 Person2:I'm doing fine.Don ' t mind me.It ' s a wonderful birthday party.Everyone is enjoying himself .  
 Person1:        I hope so . Thank you again for your delightful gift .  
 Person2:Don't mention it . 

informal