so vainly like this.

[keannu]

Can you say "so vainly like this" when you regret something so much?

It's a great regret that even though we cherished you as our best customer, our contract with you will be over soon so vainly like this.

 

[jutfrank]

No, don't say that. Use We regret that...

 

[keannu]

What about this?

It's a regret that our relationship with you will end up in vain with contract termination soon.

 

[SoothingDave]

Vain means "producing no result; useless."

Are you sure you want to tell your customer that your relationship with him has been useless?