Dear Ms. Dora,
Our journey is coming to an end, and I would like to thank you again for your excellent service. You also did a good job in recommending the three hotels in Hanoi, Hue and Hoi An that we have stayed in. In Hue, we almost felt like members of the family. We also liked the “Talk and Tea” conversation evenings that they offer. There is no obligation, but we went anyway and had very interesting conversations with some Vietnamese students. If we ever come to this part of the world again (which, for health reasons, I doubt), we will certainly come back to you.
Atentamente (that is what you write)
Friedhelm