Dear Head of the Financial Department,

I am writing to enquire about your team as I have noticed that they are experiencing low morale which is affecting their performance.   
I would like you to communicate openly with your team, set clear goals, say simple words of thanks also you can promote working together on projects and create positive environment with them. This will improve results and make them happy to come to work in addition, this will motivates everyone to keep striving.

I am looking forward to your kind reply.
Sincerely,
Yasmine Khalil