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: Can I help you ?
Person2:Yes , I'm looking for a house .
Person1: To buy or to rent ?
Person2:Oh , to rent .
Person1: How much do you want to pay ?
Person2:About 300 a month .
Person1: Well , I've got one here . It's 260 a month .
Person2:How big is it ?
Person1: It's got a kitchen , a bathroom , and one bedroom .
Person2:Well , actually I prefer something a bit bigger if that's possible .
Person1: Yes , I think so . There is also an interesting one.It ' s opposite the park .
Person2:How much is it ?
Person1: It's 325 a month . It's the biggest we've got in this area .
Person2:What's it like ?
Person1: Well , There're two bedrooms , a sitting room , a kitchen and a bathroom .
Person2:It sounds interesting . Can I go and see it ?
Person1: Of course , Sir .

Ex Output:
informal

Ex Input:
Person1: Would you like to come out with me tonight ?
Person2:Sorry , I can ' t .
Person1: Tomorrow night , then ?
Person2:I ' d like to . But I ' m afraid I can ' t .
Person1: I was wondering if you like to go to the theatre then .
Person2:That sounds great .
Person1: Ok . How about give me a ring , then ?
Person2:No . I ' d better not .
Person1: Why not ?
Person2:Because I don ' t think my husband would like it . Thank you for inviting me anyway .

Ex Output:
formal

Ex Input:
Person1: Have you heard that Tom and his wife divorced ?
Person2:I didn't hear that . But I can deduce the reason .
Person1: Really ? Say it !
Person2:Tom is a kind guy , but addicted to gambling . He spends all his time gambling in the casino . And his wife can't put up with his incessant gambling any longer , so she divorced him . Is that right ?
Person1: Yeah , quite right . Gambling broke up a happy family .
Person2:Yeah ! Gambling is often a curse . By gambling we lose time and treasure , two things most precious to a man .
Person1: Besides that , many people took to gambling and got in over their heads , and gradually ruined themselves .
Person2:In a word , gambling is a vice . We should be away from it .

Ex Output:
informal