Is it correct??

Dear ****,

Thank you for your reservation.

Your reservation is confirmed. Everything has been confirmed. We paid first day room rates.* We are providing for your first night's stay. (or: Your room for the first night is on us.)  You could pay another days room rate on arrival. If you choose to remain longer (or: another day/more days) you may pay upon your arrival (to our hotel???). Please feel free to contact me if you need any help about assistance regarding transportation or tourist information. We want your stay at [Hotel Korea1] to be both pleasant and convenient. (This last sentence is unnecessary. Just a suggestion.)

Thanks again,

[Bryan Chang]

Consierge (or whatever your title is)

Hotel Korea1 (Whatever your business is that is confirming the reservation)

*The sentence "We paid first day room rates," is a little confusing. Is your company paying for the first day and then if he/she wants to stay another day then they will be responsible to pay for the rest of their stay? That is what I assumed. If I am mistaken, let me know and I can fix it for what you want to say.

Dear ****,

Thank you for your reservation. Everything has been confirmed.

Your first-day payment has been processed. You can pay the remainder upon arrival.
If you need any help with transportation or tourist information, please contact me.

Thank you,

Bryan Chang

This might be a better way to say it, if I understand your explanation correctly.