Hi Rodoez,
Glad you got your trade sorted out,
unfortunately you may encounter situations where the person you are trading with goes afk before or during a trade due a multitude of reasons, they could be at work, have a phone call, have to deal with kids and family, they could be occupied in another trade or game or they may simply have a bad connection... it's actually quite a common occurrence.
You're best off waiting until the user is in your game before you send them any FG or even better as Krawk mentioned above, request for a mediator service, with the amount of active mediators currently on our team you'll have an almost near-instant response.
Bless!