Citizenship

Hi everyone I’m from Washington, i was wondering if anyone here can give me some advice. I’m getting impatient every time now waiting a response for my case. My situation is that i applied for n-400 February 17, 2018 and finished my biometrics March 13, 2018 and currently waiting right now for my interview. I’m having some anxiety here cause i booked a flight going back to my country for some reason on MAY 3 2018. On my case it says that my completion is on March 2019 that’s why i booked a flight in advance last year. Does anyone here had the same issue? I was just worried because I don’t want to messed up my vacation since there’s no refund at all and at the same time i was thinking if what if my interview was scheduled while I’m out of country. I know i seem to be stupid but please don’t judge me i just need some advice of what to do. I’ve read a lot of forums and this one says that it helps you out. Thank you in advance guys! ??