What is the polite way of saying this?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Does anyone know what is the polite way of saying “it depends on you sir, we don’t know your schedule for today” I ask my lecturer to reschedule his lecture

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2

How about “That’s up to you, sir, we don’t know your schedule for today.”

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3

Or, “Whenever is convenient for you.”

To me, the two above are telling the lecturer to do something, while this invites the lecturer to choose whatever is best for him or her.

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4

I would like to say something about the second phrase:

Doesn’t it sound better if you put it in the future simple: I’ll ask my lecturer to reschedule his lecture.

Thanks
Masme,

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