Salesperson: Can I help you?
Yusuf:       Yes, I want a shirt.
Salesperson: What color do you
             like; white, blue, or red?
Yusuf:       I don't know, maybe blue.

Practice:

Salesperson: Can I help you?
Customer:    Yes, I want _______.
Salesperson: What color do you
             like; ______, ______, or ______?
Customer:    I don't know, maybe ______.