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:       Jack , could you check your calendar ?  
 Person2:Sure , what's going on ?  
 Person1:        We're planning a weekend camping trip , and we want to know which weekend is best for everyone .  
 Person2:Let me see ... The weekend after next looks pretty good.Otherwise , I'm all booked up . 

formal