choosing how to flight

[Vectra]

Hello,
I am not sure about some points in this e-mail. Could you help me?

Dear Madam,
With reference to your email, we would like to inform you that there is a flight from Donetsk to London on the 22nd of December. But, unfortunately, there is no return flight from London to Donetsk on the 8th of January. We can offer you a return flight on the 6th or on the 10th of January.
The price depends on the class that you should choose. So if you choose the business class the flight will cost £400. The price includes a return ticket. But if you prefer the economy class, the flight will cost you £200.
So please make your choice and inform us.
Yours sincerely
Amanda Jenssen.
The question is - is it OK to say THE BUSINESS CLASS? Maybe IF YOU CHOOSE TO FLY BUSINESS CLASS?

[Beeesneees]

The price depends on the class that you should choose. So If you choose the to fly Business Class the flight will cost £400. But if you prefer the Economy Class, the flight will cost you £200. These prices are for a round trip and include the cost of the return flight.
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Cheers m' dears!

[Vectra]

Thank you very much indeed!

Yours,