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:       Hi ! Bob , are you having problems with that ?  
 Person2:Yes , how should I set up my new computer ?  
 Person1:        It's easy , let me help you .  
 Person2:Great , thanks a lot . 

informal