A small problem seems to have occurred with my RTW booking, and I was hoping you guys could advise me on the best course of action. A few months ago I booked the following CRWSTAR1 through a travel agent in Bangkok:

TG 991 BKK-SYD
SQ 232 SYD-SIN
SQ 318 SIN-LHR
UA 905 LHR-JFK
NH 009 JFK-NRT
NH 909 NRT-HKG
TG 603 HKG-BKK

I completed the first two of these segments in December, all the rest are coming up in May.

The big mistake I made (apparently) was when I called up United Reservations in Singapore a few days ago and asked them to move the LHR-JFK segment a couple of days forward. They duly complied and confirmed I was booked on the flight I requested, but imagine my surprise when later that day I looked up my booking on checkmytrip.com and found that the segment in question had in fact disappeared. I called up United again and informed them of the problem, but they told me there was nothing they could do and that this would pose no problem to the rest of my itinerary.

My question to you is: Is this something I should be concerned about, if so who should I contact to have it fixed? Could NH cancel my reservation with them because of this missing segment? (I assume this could invalidate the requirements of the RTW ticket.)