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'.

Example Input: Person1: Excuse me , Sir , do you know what time it is ?
Person2:Oh , it ' s almost eleven twenty .
Person1: Thank you .
Person2:You ' re welcome . The rain is quite heavy , isn ' t it ?
Person1: Yeah . I was in a hurry and I forgot my umbrella today .
Person2:I have one . We could share it . Which way are you going ?
Person1: Oh , that ' s very kind of you . I am going to the Garden Hotel .
Person2:I am going there , too . We can walk together .
Person1: Sure .
Example Output: formal

Example Input: Person1: I need help in ordering my office supplies .
Person2:You can print out a copy of the Order Supply Form from our company web site and turn in into me . What will you be needing ?
Person1: I need ink cartridges , staples , and Post-its .
Person2:Will you need all of them right away or can some wait ?
Person1: Some of these can wait but there are a few things that I need right away .
Person2:You can only buy supplies that you have a budget for . Do you know what your budget is ?
Person1: We have plenty of money for office supplies .
Person2:You can pick these supplies up or they can be delivered to your building . Which would you prefer ?
Person1: I want to pick them up .
Person2:Well , just finish the request and we will contact you when the supplies come in . Have a good day !
Person1: You too !
Example Output: informal

Example Input: Person1: There will be another sandstorm here tomorrow .
Person2:It's the fourth one this year . Isn't it horrible .
Person1: Yes . We should plant more trees and grass to stop the sand from spreading .
Person2:It may take many years for the trees to grow . I hope people will stop cutting down trees .
Person1: But we need the wood .
Person2:But we can't destroy our forests to get the wood .
Example Output:
informal