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 , I've got to get up early tomorrow , so please give me a wake-up call .  
 Person2:Of course . We can give you a call anytime you like .  
 Person1:        Actually , I need two calls , one at 7 and the other at 7 fifteen .  
 Person2:Your wish is our command . Expect a call at 7 , and another one at 7 fifteen .  
 Person1:        Wait a minute ! I don't like 7 fifteen , now that I think about it . Change it to 7 thirty .  
 Person2:The second call is now changed to 7 thirty . Is there anything else we can help you with ?  
 Person1:        Nothing that I can think of right now . If something comes up , though , I'll call you .  
 Person2:We're here all night long if you need anything . 

formal