Flat Bike Tyre

You were running late for a tutorial this morning, so you borrowed your flatmate's bicycle without asking. On the way home, the back tyre went flat and you had to walk the bike back. Your flatmate uses the bike to get to work. Speak to your flatmate: apologise, explain what happened and offer to sort out the repair.

Hey, have you got a second? I need to apologise. I was running really late for my tutorial this morning, and I grabbed your bike without asking. On the way home, the back tyre went flat, so I ended up walking it back. I'm really sorry, especially since you need it for work tomorrow. I can take it to the repair shop first thing in the morning and pay for a new tube, or if you'd rather, I'll cover a taxi to work tomorrow. Again, I'm really sorry.