Here's the completed dialogue with the appropriate phrases filled in:

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**Sales assistant**
**SA** 1. How can I help you?
**Girl** I’m looking for a laptop.
**SA** Well, the Pro-computer is very popular.
**Girl** 2. How much is it?
**SA** It’s £449.99.
**Girl** Have you got anything a bit cheaper?
**SA** Yes, the DX 800 is only £299.99.
**Girl** What features has it got?
**SA** It’s got Wi-Fi of course, a built-in webcam and a touch-screen.
**Girl** That’s great. I’ll take it.
**SA** 3. Would you like a bag for that?
**Girl** No, thanks. That’s all.
**SA** 4. Do you need a receipt?
**SA** Yes, we accept any type of card. So, that’s £299.99, please.
**SA** 5. Here’s your receipt. Thank you.
**Girl** 6. No, thanks. I can put it in my backpack.

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Feel free to ask if you need any more help!