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:       Good evening , I have a reservation under the name of Tomlinson .  
 Person2:Ok I ’ Ve found it . Checking out on the 27th ?  
 Person1:        That ’ s right .  
 Person2:Can I take a credit card for the deposit ?  
 Person1:        Yes , sure . Also , I ’ d like a non-smoking room please .  
 Person2:Certainly madam . Here ’ s your key . Your room is on the 7th floor and on the left . Room 781 . Check out is at 12 noon . 

formal