You pretend to be Richard's Sister

You turned around and reply,

"Yes, and you are?"

"Oh, I'm a courier on a urgent letter to a girl lived here call Sarah Tutor. Is she around?"

You thought for a moment, as you remembered that Richard's sister name was Sarah.

"I am Sarah Tutor. And you are looking me for?"

"Will you please accept this package and sign here?"

He handed you a piece of document and a small package. You signed and returned the signed document to him and the courier left. Out of curiosity, you unwrapped it and open it up and found a long piece of dress. You take out the dress and you placed it on the table. There is one more card, you take out and read it.

"Hi Sarah,
Happy 18th Birthday. This is for you. Sorry that I can't be with you, but hope you like the dress I gave as your present.
Tim
20 October"

You have no idea who Tim is and today is 21st October. You look around in the box and your hand felt upon some frilly underwear. You then realized you've forgotten to wear any underwear.