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:       Excuse me , is this the right counter for express mail ? 
 Person2:Yes , it is . What can I do for you ? 
 Person1:        I want to send some important documents to Canada for my postgraduate admission . 
 Person2:Are they urgent , please ? 
 Person1:        Yes , the deadline for applying is 1st Feb , so I hope they will arrive in 3 days . 
 Person2:Well , DHL is famous for its speed and reliability . It is the fastest international postal service available . The document will arrive in two or three days . 
 Person1:        Really ? But can you guarantee the safety ? 
 Person2:Yes , I promise . Your document won't be broken or lost . All the items are handled by special staff and carried by a courier . It is reliable . 
 Person1:        OK . I will send them now . 
 Person2:Please write the address and remittee on the express order and make sure there is no mistake on them . 
 Person1:        All right . Here you are . 
 Person2:This is your receipt which you have to keep until the remittee receives the express . You can also check your post on our web . The post number is on the top of the receipt . 
 Person1:        Thank you . I have got quite clear idea of it . 

informal