Like I said - please do NOT panic. Certainly not the right thing to do. You will definitely get the travel dates one of these days. I happened to get it early cause CX doesn't fly to the city where I live. I'm sure you will get the schedule soon. To call or to email them is totally up to you. If I were you, I would still give it another day or two. You have been invited to the Stage 2 interview. There is no way you will be left out.