Examples:
• Please do not hesitate to contact me if you require any further information.
• Please feel free to contact ...
• I look forward to receiving your confirmation of this appointment.
• I would be obliged if you could ensure that this mistake does not occur again.
• I hope these arrangements are to your satisfaction.
• I look forward to meeting you again in the future.
• We look forward to receiving the proposal/your order/your reply.