I would appreciate it if you could kindly advise

[rossen]

Hi,

Need to ask an important person when they would like to take a call with me.

WDYT about:
"I would appreciate it if you could kindly advise what would be the most suitable time for you having this call."

 

[emsr2d2]

Hi,

I need to ask an important person when they would like to take a call [STRIKE]with[/STRIKE] from me. [STRIKE]WDYT[/STRIKE] What do you think about the following sentence?

"I would appreciate it if you could kindly advise what would be the most suitable time for you having this call."

It's far too wordy and obsequiously polite.

Please let me know when it would be convenient for me to call you.
Please let me know when it would be convenient for us to speak by phone.