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 would like you to meet my family . Can you come to dinner next week at my parents ' place ?  
 Person2:Yeuks ! Do they know anything about me ?  
 Person1:        Actually , I've told them a lot about you . They are excited to meet you .  
 Person2:I'm a little nervous !  
 Person1:        I think you'll like them . My family is pretty laid back .  
 Person2:How Ay people will be there at dinner ?  
 Person1:        Let's see . there's my mom and dad and my two brothers and one of my sisters .  
 Person2:That's good , I'm usually more comfortable in bigger families . 

informal