ご協力ありがとうございます。
Your cooperation is really appreciated.
Thank you for your kind assistance.
ご協力のほど、よろしくお願いいたします。
ご協力のほど、よろしくお願いします。
Thanks in advance for your cooperation.
I appreciate your cooperation
I appreciated your help.
I am much obliged to you for your help.
I greatly appreciate your help.