How to express necessity with the sense of "must" at the hotel

[Storm]

My hotel students are using "must" to the guests. Are they delivering the right level of language, I mean for the guests at the resort.

A manager suggested I must teach them to use "may have to" in stead of "must".
See one example ny students may have to use

1. If you would like to get there on time, you may need to get up at 6.

if it is so, please tell me why?

[Mister Micawber]

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Yes, I would suggest that often 'must' is too demanding from a service position, so it would be wiser to select a more indirect form. On the other hand, 'you may need to' is too hesitant. This is a good choice in the situation you present:

If you would like to get there on time, you should get up at 6.
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Native English teacher at Mister Micawber's

[Harry Smiith]

[Yankee]

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I think simply using 'have to' is also too demanding from a service position. I think MM's suggestion with 'should' is your best option, Storm.
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[Harry Smiith]

[Storm]

Guests won't feel the demand if my students use "should" then.

Thanks ...

I like you guys, quick and clear.