The safest bet is a KAgency. They virtually always have someone available. Might not be your first choice, but they’ll get you serviced.

I would say for me...

If I am home and a gent has an appt cancels and is looking to book an appt with me same day with a 2hr notice or so.
Helps incredibly if he is on P411. I have done this quite a few times and it worked for me and the gent if I was available.
Perhaps try that to see who is available now on P411 or reach out to someone you have seen before.
Just had a gent I had seen back in 2018 come to town on a last minute business trip reach out to me via text.
I was glad he did as I was on the strip already saw him and had a fabulous time. In fact had such a great time he booked me again last night.
Have fun

I'm available Last min...7025057800

Just text but always have some way to verify you... Hugs Hazel