On a plane, a passenger is asking for things to drink and eat using the usual consctruction "Can I have...?"

- Hello mam, fish, chicken or vegetarian [menu]?
- Can I have a vegetarian?
- Sure, there was a cheese sandwich today?
- Ok.
- Anything to drink?
- Can I have some water, please?
- Still or sparkling?
- Excuse me?
- Gas or no gas?
- Oh, no gas, please?
- Sure. Would you like a coffee or tea?
- Can I have a coffee, please?
- Regular or decaf?
- Regular, please.
- Cream or sugar?
- Cream, no sugar please?
- Enjoy your meal.
- Thank you very much.