Aston: I can't believe our trip to Japan is in 3 months already, feels like I booked it just yesterday
Mona: True!
Mona: I'm really excited about it too, can't wait to go back there <3
Aston: If only it wasn't so far away we could go there more often but it can't be helped
Mona: Ah, speaking of which!
Mona: How much do I owe you for the plane tickets?
Mona: You should've reminded me, I keep forgetting and time flies by without me even noticing
Aston: I told you you could pay me back whenever, it's not a big deal
Aston: It was 600 euros
Mona: Hmm, do you want that in cash? Or should I send you a transfer?
Aston: Whichever is fine!
Mona: Then I'd rather transfer. Can you give me the details?
Aston and Mona are going to Japan in 3 months.  Mona owes Aston 600 euros for the tickets. She will transfer the amount.