French phrase
Mon numéro de ~ est ~.
Meaning
My ___ number is ___.
When to use it
Gives the number for a specified item or service. Neutral and polite, often used when providing a booking or reference number.
Example dialogue
Mon numéro de réservation est 123456.
My reservation number is 123456.
Très bien, c'est noté.
Very well, I've made a note of that.