How would you say "I hope you can come back soon" in Japanese?
I have a Japanese pen pal through Facebook. We became friends at my work but she had to fly back home to Osaka the next day after we met. I want to tell her in Japanese "I hope you can come back really soon!" but I'm unsure how to write the "I hope" part.
My best guess is: もうすぐ帰ってくることを願います!
(if its correct) Is this too formal to write to a friend? I don't want to sound formal, since we've been chatting to one another in very casual Japanese.