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: Consider Input: Person1: Who stands out in your mind as a man or woman of sound character ?
Person2:If I think of famous people , I think of Abraham Lincoln .
Person1: He's the US president , who walked five miles just to give a lady her change , isn't he ?
Person2:That's the one . He also was famous for never giving up on his goals .
Person1: That's right . He ran for office quite a few times before he was finally elected .
Person2:And I also admire him for his courage in fighting for equal rights .
Person1: He had great vision , didn't he ?
Person2:And humility . I would have liked to meet him personally .

Output: informal

Input: Consider Input: Person1: Ms . : Do you have a question , Mary ?
Person2:No . That's not why I raised my hand . I need to go to the ladies ' room .
Person1: Ms . : Let me give you a hall pass for it .
Person2:What's a hall pass ?
Person1: Ms . : With a hall pass , you can go to the ladies ' room or wherever you need to go during class time .
Person2:I see .
Person1: Ms . : If a teacher stops you in the hallway , just show him or her the pass .
Person2:Or else I'll get into trouble .
Person1: Ms . : That's right .

Output: formal

Input: Consider Input: Person1: David , recently I established a travelling forum , and now I want to make a plan to hold the first activity . Where can we go for this time ?
Person2:How many members are there in your forum ?
Person1: a dozen .
Person2:I think we can visit West Lake . The landscapes are attractive . It is said that just as there is paradise in heaven , there are Su Thou and Hang Thou on earth .
Person1: It's surely worth going to . There are ten famous spots there .
Person2:What can we do next after locating the place ?
Person1: Inform my members to prepare for the travelling . And then we can discuss about the travelling costs .
Output: informal