陳先生/小姐講緊電話, 請你一陣再打來, 英文應該點講呢? 麻煩幫幫忙

Mr Chan/ Ms Chan is on the phone right now, could you please call back later?

Mr/Mrs Chan is answering the phone,please call up later.

He/She is on the line right now, would you like to leave a message or get back to her/him later?

I'm sorry, Mr. X/Miss X engaged other line, could you please left a message or call back later?

Mr. Chan/Miss. Chan is talking on the phone,please call later.

Mr/Miss Chan is on the phone right now, would you please call in a bit later?

Miss Chan/ Mr Chan is on the phone right now, please call later.

Mr./Miss Chan is on phone, would you like to call back later please?