Hello,
I am glad to receive your reply. I am honored to be invited to visit your company, but I'm still in Tokyo now, and I'll be back in China at 14 july. So I want to ask you if it's possible to delay the appointments until the 15 July?

Best regards!

PS
In attachments is my personal informations

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An email ( please help me!)

Hello,
I am glad to receive your reply. I am honored to be invited to visit your company however, I'm still in Tokyo. I'll be back in China the 14th of July. I'd like to ask you if it's possible to delay the appointments until the 15th of July?

Best regards!

PS
I have attached my personal information

Good job!

Tacking on additional corrections from Kate:

An email ( please help me!)
Hello,
I am glad to receive your reply. I am honored to be invited to visit your company; however, I'm (better to say "I am" instead of the contraction because the contraction is more colloquial and less formal) still in Tokyo. I'll (or "I will") be back in China the 14th of July (or say "July 14" instead of "the 14th of July", either works). I'd (or "I would") like to ask you if it's (or "it is") possible to delay the appointments until the 15th of July (or say "July 15" instead of "the 145h of July", either works)?

Best regards!

PS
I have attached my personal information