Use 바꿀수있을까요? from 바꾸다 to ask politely whether a change is possible. End the written request with a question mark.
What to change
New value
Request
약속
화요일오후세시
약속을화요일오후세시로바꿀수있을까요?
장소
도서관
장소를도서관으로바꿀수있을까요?
장소
한빛교실
장소를한빛교실로바꿀수있을까요?
Message part
Example
원래약속
월요일오후두시에약속이있어요.
어려운이유
회의때문에그시간에는만날수없어요.
새제안
약속을화요일오후세시로바꿀수있을까요?
Give a brief reason and a specific alternative the other person can consider. 바꿀수있을까요? is a request; 바꿨어요 reports a completed change. Do not present an unaccepted request as completed.