mvi51

Have a 2002 Honda Accord EX and auto transmission slips a lot when first started or cold. Doesn’t even get out of 1st gear. If I let the car run for about a half hour so that the engine is nice and warm the transmission seems to shift pretty good without any or minimal slippage. Fluid level seems to be ok and is not burnt. Any idea what the problem is? Any help would be greatly appreciated.