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Hi!!!! all, how is going?

Below is an invitation letter, i want to make it more formal.

Dear Sir/ Madam,

There is a dinner party at Marriott (Dainty Restaurant) on Sunday by Dr. Susan on Feb 11, 2007. Please check your availability and confirm your participation.



Regards,

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Since you must have a guest list of some kind, start

Dear Mr/Mrs/Ms xxxxxxxx,

We would like to invite you [and a guest (an optional extra)] to a dinner party on Sunday Feb. 11 2007, to be held in the Dainty Restaurant at the Marriott Hotel. This is [to welcome/in honour of] Dr Susan.

Please let us know as soon as possible if you are able to attend this dinner.

Yours sincerely,
Comments  
Dr Susan requests the company of
................................................
to Dinner at ......... PM on Feb 11, 2007 at Marriott
(Dainty Restaurant).

RSVP : Tel No/ E Mail Add
Dress : (Mention if needed)