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 Mark . 
 Person2:Hi . 
 Person1:        What are you planning to do today ? 
 Person2:I'm not sure yet . 
 Person1:        Would you like to have lunch with me ? 
 Person2:Yes . When ? 
 Person1:        Is 11:30 AM OK ? 
 Person2:Sorry , I didn't hear you . Can you say that again please ? 
 Person1:        I said , 11:30 AM . 
 Person2:Oh , I'm busy then . Can we meet a little later ? 
 Person1:        OK , how about 12:30 PM ? 
 Person2:OK . Where ? 
 Person1:        How about Bill's Seafood Restaurant ? 
 Person2:Oh , Where is that ? 
 Person1:        It's on 7th Street . 
 Person2:OK , I'll meet you there . 

informal