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please correct the below sentences for any mistakes

Dear Sir,

Because of high ticket rates and non availability of seats in flights, I am not able to return to work at the agreed-upon time, and I would like to extend my leave for 3 days until 03/09/2012.

Thank you for your consideration of my request.

Sincerely yours,
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Dear Mr [surname],

Because of high ticket prices and the unavailability of seats, I am not able to return to work at the agreed-upon time, and I would like to extend my leave for 3 days until March 9th? / September 3rd?

Thank you for your consideration of my request.

Sincerely yours,
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Thank you for the kind reply. leave until Sep 3rd.
Dear Mr [surname], Because of the unavailability of tatkal Railway tickets and also haven't confirmed my ticket on saturday and will get the ticket. On sunday, I am not able to return to work at the agreed-upon time, and I would like to extend my leave for 1 day on Monday 26. Thank you for your consideration of my request. Sincerely yours, Please correct the sentence
I guess that this is what you mean:

Dear Mr [surname],

Because of the unavailability of Tatkal Railway tickets and also because I didn't confirm my ticket for Saturday, I will get the ticket for Sunday, so I am not able to return to work at the agreed-upon time, and I would like to extend my leave for 1 day to Monday the 26th.

Thank you for your consideration of my request.

Sincerely yours,
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