Make sure you use good grammar, unlike this sentence.
One normally does not have to reply to a thank you letter.
The correct reply to "god speed" would be "Thank you" or "And to you as well."
my pleasure
you welcome
response
"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
Thank You.
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).
i am glad to help you