E-mail English: Formal vs. Informal Register

Relaciona las expresiones informales de la izquierda con sus equivalentes formales de la lista desplegable de la derecha.
I'm writing about...
Could you send me the price list?
I need to meet you soon.
I can't accept your offer.
We are dissatisfied with your service
You haven't paid our last invoice.
You're wrong.
I'm sorry for the delay.
I can't make it to the meeting.
See you next Friday.