Provide the theme summaries for the following conversation: 

#Person1#: Alright, Sara, we know that you're planning something big for John's birthday. Could you tell us just what you have in your mind?
#Person2#: I wanted to make his birthday a very special event. John has a sister living in France and I'll send her a plane ticket so that she can be here for his birthday.
#Person1#: Boy, what an excellent plan! That's something special. I kind of guessed you had some secret plan and we're waiting for the right time to tell me.
#Person2#: Well, I didn't want to say anything until I was sure she could come.

Summary: 
#Person1# asks Sara about the surprise for John's birthday. Sara plans to send a plane ticket to John's sister so his sister can be there for John's birthday.