I made my reservations via my miles card that uses travelocity.
Three of us traveling MSP --> IAH --> CUN and back. All seated together both ways.
My name middle/last and Jr. was all messed up so I called United and they fixed my name for no charge.
The next day I looked and my seat reservation was removed.
All but one flight I was able to recover my original seat, the CUN --> IAH my isle seat was gone.
I bought my was into the extra leg room seats so we could all be together.
My wife did not want to be in a row with our 4 yrs old grandson and not have the isle seat.
So note when changing names to inquire about the seat reservations.
I wish I had thought about it, just assumed. Stupid me.Edited: 2:58 pm, April 04, 2013