Help!!! level 4 cannot get through it

OK, this is a slowpoke variation that should get you to Expert. I'm sure one of the faster people can give you a walkthrough that will score even more points, but this will get you an Expert star.
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The key to this level for me is good color matching and good use of the podium. Many times I let the hearts fill at the podium two or even three times to get everyone charged up before I seat them. That's because the only thing you have to work with on this level is drink and main orders--there are no snacks or desserts for extra points.
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Also, in most rounds I'm only seating 3 or 4 groups. That lets me serve everyone before they lose hearts.
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Make sure you let the heart cycle finish at the podium before running over to one of the tables, unless you're about to lose a customer.
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Also, it is absolutely essential on this level that you have two different chains, one for money and one for dirty dishes. So when a diner finishes, click on them just once, not twice. That will pick up their money and leave the dirty dishes on the table. Then move on to the next one to get their money. Pick up everyone's money before you go back and get the dirty dishes.

Before I seat each group of diners, I pretty much do the same things: chain money pickup, chain dirty dishes pick up, put out flowers. Go to podium and let hearts fill two or three times. Then start seating.
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1. 4 red businesswomen lower middle
2 blue businesswomen upper middle
2 blue businesswomen top of bar
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Give drinks at the end of each chain--after picking up orders, after giving out food.
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2. 2 green teen boys lower left
4 blue teen girls upper left
3 cellphone guys lower middle
2 red/blue joggers upper middle
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3. 2 blue/green tourists upper middle (match blue)
red family lower middle (give highchair)
2 green businesswomen lower left
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If the family spills, don't break your chain. Either get the spill before you start taking money, or take everyone's money before you clean the spill.
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4. 6 joggers on the left, match the green
family with senior lower right (match colors)
2 blue bookworms top of bar
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5. 2 green celebrities lower left
2 red teen boys upper middle (no color match, that's ok)
2 blue/red teen girls upper left (match colors)
blue man and boy top of bar
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6. 6 teen girls upper left (match blue)
green/red family lower middle (match red, give highchair)
4 joggers, top bar (match blue)
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The key is not to try to seat too many people at once. This lets you keep everyone happy at the tables while you use the podium to keep the ones in line happy. And it gives you good color matches almost all the way through.
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Good luck!

Oops, the family with the senior goes in the lower middle, not the lower bar. I think that's obvious because I said match colors, but in any case I meant at the table, not the bar. The only part of the bar you will use in this walkthrough is the top near the drinks station.