One normally does not have to reply to a thank you letter.
response
you welcome
The correct reply to "Godspeed" is "Thank you." It's a polite way of wishing someone a safe and prosperous journey or endeavor. So, next time someone tells you "Godspeed," just say "Thank you" and be on your merry way.
"Thank you for the prompt reply!"
You can write a simple 'thank you' when you make a reply.
"Thank you, it was so kind of you to remember me"
Thank you for your quick reply
You're welcome!
No, it is not. When not used as a direct reply (means I express gratitude to you), thank you is a noun (often written thank-you).
Your welcome. Spanish(Da' nada)
i am glad to help you