I enclose a stamped, addressed envelope for your reply.
Please write me as often as you can.
And next time, I will make sure that I send a letter in time.
Ail the best.
Best of luck to you!
With all good wishes!
We certainly wish you all the happiness in the world.
With best wishes from all' of us on...
With kind/ kindest/ best regards.
Give my love to Mary and the children.
I (will) love you forever.
Kiss the children for me.
My thoughts are always with you.
All your old friends send their love.
I want you to know I am thinking of you.
Remember me to your mother, and to George and many thanks again.
My mother joins me in wishing you a very merry Christmas and a happy and prosperous New Year.
I hope you will have a very nice holiday.
Take care of yourself.
Have a good time and write often.
Please forgive me for troubling you in this way.
I do hope you will accept my heartfelt apologies.
Edward joins me in apologizing for troubling you and we both send you our best wishes.
Though I am in no way responsible for this unfortunate situation, I will naturally do everything in my power to remedy it.
Once more, please forgive me for not returning this thing to you immediately.
Forgive me for having to write such a letter, but, believe me, I have no alternative.
Please forgive me, but my decision is quite irrevocable.
You are a dear to write me so often.
Your letters make me so happy.
If you do not reply within two weeks, I will have to change my mind and...
Let me know what you decide.
If you are not free then, let me know if there is any other time which would be more convenient.
Please do let me know soon if you are interested in it.
What do you think?
Let us know when to expect you.
Don't forget to...
Let me know if this is convenient for you.
Would that be possible?
If you know of any book which might be of assistance to me, I would be most grateful.
While I greatly regret the inconvenience, I feel sure you will understand it was due to circumstances quite beyond my control.
I would be grateful if you would send me further details and an application form.
Perhaps you would be kind to let me know if this is convenient.
I am sorry to bother you with this, but I don't know what to do.
I don't know what I would do without you.
If you have time to give me any assistance, I will be greatly in your debt.
Thanking in advance/ anticipation.
I thank you in advance for your much valued help.
Let me thank you in advancefor your help.
Let me thank you once again.
We are indebted to you for...
Please let me know what I can do to help.