Is it possible to add a person to my reservation?

Meaning

Request to increase the number of people in a reservation.

Examples

• John: I need to change my reservation.
• Alice: Certainly, what needs adjusting? <b>Is it possible to add a person to my reservation?</b>
• John: Yes, that's right. We've decided to bring an extra guest. <b>Is it possible to add a person to my reservation?</b>
• Alice: Let me check the availability and the associated charges.