Letters / 'Dear Partner' - an opinion letter to a company, help me edit this text [3]

Dear Partner,
First of all, Vietrantour Company is pleased to thank Partners have been with us during the past!
To improve service quality and professional operating modes of service, to promote tourism cooperation, Vietrantour invite Partners to sharing feelings, assessing quality of service, tourism products and working style of the staff, the level of cooperation, collaborative development opportunities through "Surveys of partner's satisfaction with Vietrantour"

The shared data source is extremely valuable to Vietrantour constantly improve, professionalize operations. We really hope Partners take a few moments and share feelings, assess about Vietrantour through enclosed documents!

Once again pleased to thank and hope to receive the support of partners in the future!
Respect,
Public relation department