The proper ettiquete to cancel a meeting is to send an email or make a phone call.
If you plan to cancel a meeting in advance, you should sent an email politely stating the reason(s) why you cannot make it for the meeting. You can also ask that the meeting be rescheduled.
If you are canceling on the day of the meeting, it is best to make a phone call, state your reason(s) for cancelling, be honest to the other party, let them know you are truly sorry for cancelling. You can call later or send a mail later to apologize and ask that the meeting be rescheduled.
You have scheduled a meeting with people that you need to work with but at the last minute, you are going to cancel it. How are you going to cancel a meeting following business etiquette? These are just a few tips to remember: It is best that you re-schedule a meeting a few days in advance. It will allow people to fit you into their schedule again. Another tip is to call through phone.
You need to apologize the most formal way possible and this is through the telephone so that other people can detect the sincerity of your apology about rescheduling the meeting. One more thing to remember: if you reschedule for the third time, the person is not going to want to talk to you anymore.