Flirting

How do you reply to a "sorry didn't see your text"?

I work with a girl, basically This girl is in to me i know she touches me, talks to me and always tries to get near me. I asked her this weekend (friday) if she wanted to do something and she said yes. She was out of town but said Sunday but i told her to message me when she got back. She never messaged me so (sunday) came along 5pm i texted her if she was down to go to (x). We both work Monday i go in at 1, her at 2 and at 1pm she texts. "sorry i didn't see u text". How do i respond to that if i never checked her text, we were working. and it was a little awkward but we made VERY small talk this time for once. I am out and she is working currently, but how would i literally respond? I was on Delivered for a day. Do you think there's any chance she is still interested? She still smiles and plays around with me a little bit.
How do you reply to a "sorry didn't see your text"?
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