"We spend the time and energy searching all over the web for cheaper reservations for you", are you really spending time on searching things manually? If so, I wouldn't pay anything for such a service, because you may apparently go on holiday and don't care about my reservation. If all is automatic, then I could go for it. However, then "spending time and energy" is a lie.

I believe anyone should be able to submit their reservation, along with credit card details. If you do find the cheaper rate somewhere, you charge them at that point and present with the offer.

BTW, A typo: we can try to ehysave you money.