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:       Hello . Can I sit here ? 
 Person2:Yes . 
 Person1:        By the way , I'm Robin . 
 Person2:Hi . My name is Jessica . 
 Person1:        Nice to meet you . 
 Person2:Pleased to meet you too . And where are you from , Robin ? 
 Person1:        I'm from Kathmandu . What about you ? 
 Person2:I'm from New York . Oh , this is my stop . Bye , Robin . 
 Person1:        Bye . See you . 

formal