Join Date: Nov 2013
Location: NYC / TYO / RSW Up in the Air avoiding the Snowflakes
Programs: UA GS 1.8MM, AA 2.1MM, EK, BA, SQ, CX, Marriott LT, Accor P
Posts: 8,058
OP - I realize this may be a sensitive subject -- but the more information you can give us the more we can help....
As others have pointed out the devil is in the details -- did you buy the ticket with your money? What are the fare conditions / basis? Is the flight only valid from Viet Nam? We need so much more information to help -- try not to worry about anything else -- just give the total picture.... On UA in general unless it is a basic economy fare you should have some options - especially since this is an international ticket....