英语写邮件背景：老板最近想要拜访我一直合作的一个客户,要怎么写信给他说这件事,能够正式一点最好（老板之前并未接触过此客户

Dear Mr.xxx,
Good morning.
I am writing to share with you the plan of my boss,Mr.XXX to pay you a visit.
In order to thank you for your cooperation these years and seek more opportunities to strengthen our business relationship for our mutual benefits,my boss is planning to visit you recently.
Could you please tell us when you are available?
Hope this coming meeting will bring more benefits to us two!
Your positive responses are warmly awaited with keen interest!
Sincerely yours,
XXX