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:       Can I help you ?  
 Person2:Yes.When is the next train to New York City ?  
 Person1:        Let me see ... the train to New York City ... here it is ... daily except Sunday at ten thirty , twelve twenty and fifteen ten .  
 Person2:Aren't there any trains before ten thirty ?  
 Person1:        Sorry , not before ten thirty .  
 Person2:Then one to New York at ten thirty .  
 Person1:        One way or round trip ?  
 Person2:One way .  
 Person1:        A soft seat or hard one ?  
 Person2:How much is a soft ?  
 Person1:        15 dollars.And for a hard one , only 6 dollars .  
 Person2:Then one hard seat , please .  
 Person1:        OK.Here is your change.The train leaves on platform 8 . 

formal