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'.

Ex Input:
Person1: I think we should accept his plan .
Person2:I'm afraid I can't agree with you .
Person1: Why ?
Person2:Simply because it's not practical at all .

Ex Output:
formal

Ex Input:
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 .

Ex Output:
formal

Ex Input:
Person1: Come and sit down . Would you like a drink ?
Person2:Oh , yes please ! I'd love a gin and tonic .
Person1: Do you like olives ? Or would you prefer crisps ?
Person2:Oh , just olives please . What music is this ?
Person1: Do you like it ? It's Irish music .
Person2:It's great ! Where did you get the CD ?
Person1: Arm - I think it was in the CD shop in the Mall . Have you been there ?
Person2:Yes . I buy a lot of stuff from there . It's a good shop , isn't it ?
Person1: Yes . Hey , I've got some photos of our holiday in Ireland . Would you like to see them ?
Person2:Why not ? I'd love to !

Ex Output:
informal