There are several ways. One of colloquial expressions which I think most naturally describes "hope" as appearing in that sentence is: "...to iina to omotte imasu" (といいなと思っています)　which is similar to "it would be nice if..." 「あなたがパリに来られる時間があったらいいなと思っています」 (anata ga pari ni korareru jikan ga attara iina to omotte imasu) Other informal variations include: "...たらいいのにね" (tara ii noni ne) "...といいね（to ii ne）" 「いつかパリに来られたらいいのにね」 (itsuka pari ni koraretara ii noni ne) 「そのうちパリに来られるといいね」 (sonouchi pari ni korareru to ii ne) kono kotae　ga anata no o-yaku ni tattara iina to omotte imasu. (I hope this answer is helpful to you.)