Since I have been at a major airline for 14 years and my latest ex 15 yrs. most of which was with me. I can tell you this, lying generally gets you nowhere. The agents get that crap day and night and could not care less what airline you say you work for...because they immediately know you are full of shit because if you worked for an airline you wouldn't be up at the desk bothering her during the busiest time of her day. That lie is an obvious one and keep in mind the reason you don't get asked for your federally issued "airline I.D." required to work at any U.S. airport, is because if you don't produce it it is a criminal offense. If you choose to flirt you will most certainly piss off the mechanic or ground worker that is most certainly dating the young lady or interested in her which ingratiates you to noone.
I have an idea try this.............say........."excuse me, I am traveling to somewhere U.S.A., and was just curious if there was any way at all you could move me up to first. I know it is asking alot and am truly grateful for any help you could give me in the manner"..........this will get you a guaranteed truthful and kind answer regardless of what it is.
As far as degrading the job, which is the most thankless at any airline, of ticket/gate agent by flirting, lying, or being brash and hurtful, leave that crap at home and simply treat the agent as you would want to be treated and you will be suprised at the response you get.
I travel stand by (having girlfriend in Ca and me in Tx) all the time and, I realize I have the inside track, all the time and that is the best way to get an upgrade.