Does anyone know the viability of this approach to using my companion certs?

I have two companion certs (Juniper) to use. Must tx by Aug 28, 2006 and use by Feb 28, 2007.

I am not able to actually travel in that timeframe.

Can I book the tx to meet the stated requirements, then in say Jan, re-book for summer '07?

thanks,

I believe that if you make a change, your $99 companion ticket becomes useless because there is a $100 change fee.