Thank you so much for your kind offer to help. I really appreciate the time and effort you put into improving my letter. Your suggestions made a big difference.
It's great to hear that you work in China and I'll definitely keep your offer in mind in case I have any questions in the future. It's always helpful to have someone with experience to reach out to.
Thank you once again for your generosity and willingness to assist me with my letter. I hope you have a great day!