Dear Madam, Dear Sir,
My mother and I travelled with your agency 3 weeks ago.
We have been very happy of all the trip. That is why I wanted to thank you again.
I will of course recommend your agency to all of my friends, but if you want me to write a comment on the internet for your agency, please tell me the site you prefer and give me the links, name I should mention on it (Vietnam Impressive is ok?)
Best regards,
Guilhem