I look forward to receiving your reply/order/products…
Looking forward to hearing from you.
I hope this information will help you.
Please ( feel free ) contact me if you need any further information.
Please do not hesitate to contact me if you have any concerns.
Please (feel free) let me know if you have any questions or concerns.
If we can be of any assistance, please do let us know.
Please feel free to contact me if you have any questions.
If there is any problems (questions/ concerns), please do not hesitate to contact me.
If there is something we can do for you, please do not hesitate to tell us.
Please feel free to e-mail me if you have questions.
I will be in touch with you soon. (我會再和你連絡)