I would be very grateful if somebody could translate this email that I need to send to a clinic in Spain. No medical terms.

My name is --- --- (historia clinica No. ***.***) and I have received a letter from your clinic indicating that you can schedule an appointment for me in the month of July, 2007. I would like to ask if it is possible to schedule this appointment after July 25 or in the first week of August, because I will not be able to arrive in Barcelona before July 25.

Many thanks.
I'm looking forward to hearing from you.

Yours respectfully,...
I leave the opening and ending greetins for you to fill in as you see fit for this email. English is not my native language and I hope I haven't made (m)any mistakes.

Thank you so much for your help!