How should I ask to reschedule my immigration appoinment?

well, I got immigration letter for my form I-485 to register/change status to permanent resident...date is 11/21/2008...but my wife is going abroad and coming back on 11/30/2008 and she bought nonrefundable ticket...how should i present my case so that i can reschedule the appoinment with easy?How should I ask to reschedule my immigration appoinment?
It is very important not to miss your interview. If you have to miss your interview, you should notify the office where your interview is scheduled by mail as soon as possible. In your letter, you should ask to have your interview rescheduled. Rescheduling an interview may add several months to the naturalization process, so try not to change your original interview date. If an emergency arises and you absolutely cannot make your appointment, call the National Customer Service Center at 1-800-375-5283 to request rescheduling. The USCIS will record the information, and pass it on to the local office, which will make the final decision whether to reschedule your appointment. If you miss your scheduled interview without notifying USCIS, we will ';administratively close'; your case. Unless you contact USCIS to schedule a new interview within 1 year after USCIS closes your case, they will deny your application. The USCIS will NOT notify you if we close your case because you missed your interview.

https://www.immigration-bureau.org/c_faq鈥?/a>



http://books.google.com/books?id=Lj7ZTbs鈥?/a>



Second link shows a sample letter to request rescheduling and advises you need to show you cannot attend for reasons beyond your control.How should I ask to reschedule my immigration appoinment?
can i reschedule my appointment on 11/21/2008 to another date...

try to sound as polite as possible
YOU dont.

YOU be there (at the interview) or you lose your status.

your wife can buy a new ticket.
Eat the ticket. You knew a long time ago this was pending. Your risk? Go to the back of the line. Be prepared to be on the line for hours and hours if you are going to call. Best thing would be to go to the office, be polite, and see what they have as an alternative. Don't expect them to be sympathetic.
You need to be there. Bite the bullet and be there if this is something that is as important to you as it should be.