Translation of agent in Spanish

I hope you can understand the corrections this way... Two small errors. let me know if there is a word or sentence or phrase that you didn't understand! I will try to think more on the "since" question...
Sammy our cab driver brought us to the hotel, he promised to pick us up a few hours later. We took a shower and rested a little. I could not sleep because I was too excited of being in a new country.
Sorry but I hadn't have enough time in the last two weeks to respond to your email and to your interesting offer. I really need to think about it a little longer, and I am sure you'd understand.