It is a pity that you cannot dine with us this time because of your tight schedule. When you come to Hong Kong next time, we hope that we will have a chance of entertaining you.
Good was a pity your this time catches up with compels, cannot eat meal with us, next time you will come Hong Kong, again will invite you at the appointed time
It was such a pity that you can't have dinner with us this time because of your tight schedule, we will take you out again next time you come over to Hong Kong.
好可惜你今次的時間趕迫, 不能跟我們吃飯, 下次你來香港, 到時再邀請你(Time which very pitiful you now a time rushes to force, can't have a meal with us, you come to Hong Kong next time, inviting again you by that time )
It is a pity that you are in such a hurry this time, we will have to skip lunch/dinner this time. We will have to make it next time when you are in town.
It's too bad that we couldn't have a gathering this time due to your tight schedule. Let's have a meet next time when you come to Hong Kong.