We can use different language forms to talk about the future.
1) We use going to to talk about what we intend to do and have already decided to do. We’re going to attend the seminar in France next week. Are you going to book the tickets for the flight?
2) We use will or ‘ll to talk something we have decided to do at the time of speaking: the flight’s late. I‘ll call the office to cancel the meeting.
3) We use the present continuous to talk about a fixed arrangement. I’m travelling to Germany next week. Are you flying on the same flight as your boss?
4) We use the present simple to talk about a timetable or programme. The train leaves Rome at 2 p.m. tomorow. It doesn’t stop at Milan.