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:       If I remember correctly , time of delivery is another point on wich we differ . 
 Person2:That's right . Let's go into the details . 
 Person1:        Ok . I hope you can have these goods delivered before the end of Sep . We'd like them to be there in time for our Christmas sales . 
 Person2:Christmas doesn't come until almost the end of the year , right ? 
 Person1:        But in the United States the Christmas season begins about a month before Dec . 25 . 
 Person2:Well . I am afraid it will be difficult for us to advance the time of shipment . Our manufacturers are fully committed at the moment . 
 Person1:        I hope you'll try to get them to step up production . 
 Person2:As new orders keep pouring in , the workers are working three shifts to step up production . 
 Person1:        If that's the case , there is nothing more to be said . 
 Person2:I am sorry . 
 Person1:        What's your last word as to the date then ? 
 Person2:I said by the middle of Oct . This is the best we can promise . 
 Person1:        All right . I'll take you at your word . 
 Person2:Good . Let's call it a deal . We will do our best to advance the shipment , but your L / C should be opened early Sep . 
 Person1:        I promise . 

informal