If another passenger complained about the reclining passenger, what would you do?
If another passenger complained about the reclining passenger, what would you do?

At first, I would say sorry for the inconvenience. 
First, I would like to apologize for the inconvenience.

And then, I’ll explain that we only can urge the passengers to take-off an upright position when the mealtime, take-off and landing. 
Then, I’ll explain that we can only urge the passengers to assume an upright position during mealtime, take-off, and landing.

So I’ll help unsatisfied passenger to lean back and then I’ll keep my eyes on the passenger and check if the passenger needs anything.
So, I’ll help the unsatisfied passenger lean back, and then I’ll keep an eye on them to see if they need anything.