"Travelling can be stressful and our aim is to make the interaction between human (passenger) and computer (check-in) as natural and helpful as possible."
Remember those stickers on the registers at K-Mart, facing the cashier, with the letters, "TYFSOK"? It stands for, "Thank You For Shopping Our K-Mart." The sticker was to remind the beleagured minimum wage employee to recite the words. Did anyone, ever, feel that the person mechanically parroting that catch phrase actually cared? How about the greeters at Wal Mart? (I think they've pretty much gone away, like the TYFSOK stickers)
You can teach an automaton to mimick human emotion, but even when it is an actual human such mimickry is patronizing and irritating. If you want human warmth, hire warm humans (downside; warm humans who can keep their positive mental attitude while working at an airport are expensive and they need time to recover from their shifts).
If you are going to use computers, embrace their natural advantages. Computers are fast, predictable, and emotionless. Those can be good characteristics in a user interface -- particularly when the customer just wants to get the process finished and move on. Work with the entire industry to develop a standard interface and sequence so the user and bang through it without even engaging their brain -- everyone is better off with travellers on autopilot. Painting a computer in whore's makeup won't make it a lover for any but the most desperate.
And, for you air travellers, a quick question: Why are you still endorsing them? Why are you still agreeing to be subjected to the TSA and the awful customer service of the airlines? Have you really made all reasonable efforts to switch to alternatives? If you aren't making significant personal sacrifices to cut their cashflow, you are lending aid and comfort to the enemy. I've driven 6,000 miles in the past year avoiding air travel. What are you doing?