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'.
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Question: Person1: Good afternoon . Reservations . May I help you ?
Person2:Yes , I'm calling from Tenga Company . I'd like to know if you have rooms available for the nights from October 8 to October 12 . We are going to have a business conference .
Person1: May I ask how many people there will be in the party ?
Person2:20 persons .
Person1: What kind of room would you like ?
Person2:Double rooms with twin beds .
Person1: A moment please , sir . Yes , I can confirm 10 rooms for those days .
Person2:Thank you . Is there a special rate for a group reservation ?
Person1: Yes , there is a 10 percent discount .
Person2:That is fine .

Answer: formal

Question: Person1: T he nineteenth of June is my birthday . I'm planning to have a small party . Could you come ?
Person2:Happy birthday to you ! I'd really love to come , but I'm not sure right now . I'll try to make it.Thank you for your invitation .

Answer: informal

Question: Person1: Now , you are to board the plane.We ' re sorry that we haven't done much to help you when you stayed in China .
Person2:I appreciate what you have done for me.Everything I have seen here has left a deep impression on me . I really don't know how to express my thanks to you .
Person1: We are ready to help you .
Person2:Will you be kind to say " Thank you " to Mr.Zhang and other friends for me ?
Person1: I'd like to . I'm sure your visit will help to promote the friendship and understanding between both of us.Welcome to China again .
Person2:Of course , I will.Well , it's time for me to say goodbye.The plane will take off soon.Hope some day you will come to America for a visit .
Person1: Thank you . I will if I have chance.Goodbye and happy landing !
Person2:Goodbye !

Answer:
informal