请用地道英语表达：Dear Sinead LittI did not make it happen to travel to Australia for the meeting due to delate of the Visa approvalMaybe you check out that in the check-in list of the conferenceBest regardsYo

Dear Sinead Litt,

I regret to inform you that I was unable to travel to Australia for the meeting due to a delay in visa approval. Perhaps you can verify this information on the conference's check-in list.

Best regards, Yongdong Dai