Reward Certificate Redemption Help Please

Hi there,

I am from the UK and have recieved a free weekend night redemption certificate for a Standard Room Reward from my Hilton Visa. According to the terms I have to book via telephone. When I call up they said that there is no availability for my dates.

When I check availability on the hhonors website it says there is award availability. However when I login to my hhonors account and search for hotels there is no availability. I was wondering if anyone could shed some light on this?

Thanks