I asked a girl out on a date at a coffee shop. This is the interaction: (translated from czech, excuse me for any mistakes)

Me: "We should meet again sometime, are you free Thursday afternoon?"

Her: "Well, I am seeing a girlfriend Thursday afternoon, I don't know the exact time yet"

Me: "Okay, when you are free, we could go to a coffee shop :)"

Her: "Can be :)"

That was 2 days ago, I haven't messaged her since.

I have a feeling that I am on the edge, she is too hot for me (well, I am telling myself that that is bullshit, but anyway.. it is there).. and if she senses that I am even a little bit boring, she will cancel or make an excuse. This is my first date and as you can probably tell I am nervous as hell, even tho I am trying to suppress it.

I have to message her again, obviously, to closer specify the place and time. But I don't want to do it out of the blue... but I also think that simply asking her "Hi, how are you?" first is too boring.

What do I do?