If you were friends with this person, just tell them what you feel. There is no worry about saying the correct thing or using the right format. Goodbyes are more heartfelt.
Some ideas to get you started would be to bring up some of your favorite things about them, and a good memory you had with them. You can also talk about the things you will miss when they are gone.
Include any contact information you want to them to have.
An example:
Dear John,
I was so sad when you told me you were moving away, but I am excited to hear about all the great new things you will be doing. I hope you send me a lot of pictures from YourNewTown.
You've always been so positive and happy. I've appreciated having you around when I had the occasional rough day. It made things easier having a friend like you.
I always think about the time that we did that thing? Remember that? The police were not amused. I was so relieved when they let us go. I did not want to have to explain that to your mom. That night was a lot of fun.
I'm going to miss having lunch with you every day. I am going to have to relearn my entire routine. You are forcing me to go meet new people!
You have my cell phone number and Facebook. I hope you use them a lot!
Miss you,
Jane
mostly "with love _________" you could say "someone" on the blank if you want it to be secret
If they poured their emotions into it i suggest doing the same but in any other circumstance you dont usually reply
thank you = arigato gozaimasu
good bye= sayo nara
Depending on the circumstances, a reply may not be necessary. If you fell that a reply would be appropriate, base your reply one the circumstances of the departure and the content of the thank you letter. Be sincere and say what you feel but don't go too far. If you don't have anything good to say, don't reply.
To reply to an explanation letter, simply reply to the issues and concerns raised in the letter.
definition of reply to inquiry letter
what is the meaning and example of letter of inquiry and reply
Letter to Loretta - 1953 Goodbye Goodbye 4-9 was released on: USA: 21 October 1956
Sample of the reply of show cause letter?
what is a letter of complaint
Never!
A letter of inquiry is written when seeking information. A reply letter is written as a response to a communication received.
An inquiry letter is a request for information or for something material, such as documents, money, goods, or property. The reply letter is the answer to the inquiry.
One normally does not have to reply to a thank you letter.
reply