Grammar fix
I have a reservation under
give your booking name
How you tell hotel or restaurant staff that you have booked, giving the name the booking is under.
expressionB1common
Hear it in context
Notice where the phrase sounds natural.
Hello, I have a reservation under Maria Santos.
A: Do you have a booking with us?
B: Yes, I have a reservation under Santos.
Fix the pattern
One small grammar move makes it sound right.
Not: I have reservation on my name Sam.
Say: I have a reservation under Sam Lee.
Use 'a reservation under [name]', not 'reservation on my name'.