for or on

I believe 'for' would be preferred.
The reservation is 'for' a particular day and time.
You might be misunderstood, if you want the action done right away - not delayed until Wednesday.

wilpeterI believe 'for' would be preferred.The reservation is 'for' a particular day and time.You might be misunderstood, if you want the action done right away - not delayed until Wednesday.

Thanks for helping.

Do you mean that with 'on' I might be misunderstood, if I want the action done right away, not delayed until Wednesday?

Yes, if you say please reserve the room 'on Wednesday', it might be interpreted to mean don't record the reservation until Wednesday; which might allow someone else to steal it by arriving Tuesday and asking for it.

wilpeterYes, if you say please reserve the room 'on Wednesday', it might be interpreted to mean don't record the reservation until Wednesday; which might allow someone else to steal it by arriving Tuesday and asking for it.

Yes, I feel that too. But I wasn't sure if you meant it was only the case with 'on' or 'for' as well. So that is not the case with 'for',

Anonymous Do both ‘for and on’ have the same meaning here?Please reserve the room 'on or for' Wednesday from 2 to 3pm.I want to indicate that we want to use the room on Wednesday and I would like it to be reserved.

Could it be interpreted as "Please reserve the room (for me) on Wednesday for another day (say, Friday)? Thanks.

Yes. It is always safer to say the 'for me' rather than assume someone will correctly interpret it.

Do both ‘for’ and ‘on’ have the same meaning? No.
Please reserve the room ‘for’ me, ‘for’ Wednesday, ‘for’ a function, ‘with’ no down-payment.
I will do so ‘for’ a fee, ‘for’ you, ‘as’ a recognized guest ‘of’ the hotel.
I will be here ‘on’ Wednesday and will pay ‘for’ the room rental ‘on’ Wednesday.