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:       Is that room service ?  
 Person2:Yes.what can I do for you ?  
 Person1:        May I ask for a wake-up call tomorrow morning ?  
 Person2:Fine , what time do you want to get up ?  
 Person1:        6:30 . My room number is 305 . 

formal