Dear Ms Goddard
With reference to your letter of November 3, I am writing to thank you for your kind invitation.
I would be very pleased to accept your invitation to visit Oxford and see Trackplus' production facilities. I would also be interested in meeting your colleagues at Head office, the design team in particular. I should also be delighted to accept your offer of arranging for me to see a play in the West End.
Unfortunately, due to a business trip abroad, I am unable to come to England at the end of November as you suggested. However, as I feel it is important that we meet before Christmas I would be grateful if you could tell me if the second week of December would be suitable for you?
I look forward to hearing from you again.