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:       Can you help me set up my voicemail message ? I just got this service and I am not really sure what I am supposed to say .  
 Person2:Sure ! You just basically gotta let the caller know who they called , and ask them for their contact information so you can call them back .  
 Person1:        Ok , so can I say , " This is Abby's voicemail . I will call you later , so leave me your name and number " .  
 Person2:That's more or less the idea , but try something that sounds more friendly .  
 Person1:        Ok , so how about this , " This is Abby and I am really happy you called ! I promise I will give you a ring as soon as I can , so please leave me your name and number . Talk to you soon ! " .  
 Person2:A little too friendly Abby . Just say this , " Hi , you have reached Abby . I am unable to answer your call right now , but if you leave me your name and phone number , I will get back to you as soon as possible . Thanks " .  
 Person1:        That's perfect ! Can you say that again and record it for me ? 

informal