Hi @Brenda31,
I'd be bummed too. But all is not lost.
First off, you made an request to book, so your host has to respond with accept or decline.
I think what you wanted to do was make an enquiry by chooing 'Contact Host' on the profile. Then the host can either decline, ask for more information or give you a pre-approval. The pre-approval means the host is happy to have you if you wish - you have 24 hours to book if you wish.
As you didn't seem to understand the system, there is a good chance that Airbnb will be sympathetic.
Finding them is tricky. I found them here: https://www.airbnb.co.uk/help/contact_us
Scroll down past the boxes and there was a button with "My host wasn't able to answer my question". See what happens there.
There's also an 'Urgent' button higher up on that page you could consider.
Hope that's helpful!
Enda