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 , is Jack there ?  
 Person2:Speaking .  
 Person1:        Jack ! It ’ s Rose here .  
 Person2:Hi , Rose . How ’ s everything ?  
 Person1:        Fine , thanks . I ’ m having several friends over for dinner this Saturday . And I was wondering if you have the time to join us .  
 Person2:Sounds good . What time do you want me to come ?  
 Person1:        Is six o ’ clock okay ? 

informal