IPhone :: Changing Reservation From White To Black?

I'm going to apple store, brent cross this thursday, and have phoned them up regarding this and they have told me they 'do not know yet'.I was wondering though, from your point of view, how would you see this: I have reserved a 32gb black phone. I did want a black but now that I've seen the white hands-on I think I would prefer it. I won't know until I go into the shop, however, and get my hands on either.I intend to be one of the first in line. I will wake up VERY early that day and drive myself down there. I have been saving up for 2 years to buy myself this phone and I think it'd be a waste if I didn't at least put in the effort on the morning to ensure the day went well. My only problem is, there will be two lines right? One for reservations and one for unreserved. I'm wondering if I could line up in reserved and then when the store opens and we find out what phones they have (whether white or not is available) if they will let me swap my reservation OR will they send me to the back of the unreserved line? And I'm worried what people will think if I bring my girlfriend with me and strategically place her at the front of the unreserved (without pushing in front of anyone ofc) and if they told me I needed to be unreserved to get a white I just swapped places with her (she wants a black one anyway but hasn't reserved)? In the end I didn't skip any lines and it's not like you moved back any number of places, and it's not like I didn't wait for the same time as you.