Extending a use case helps to extend an existing use case rather than redefining the use case from the ground up.

A customer orders a Birthday cake at an online website and places a request note to write his/her name on the cake. The customer goes to store and picks up the cake.

Draw a use case model using extend relationship (Hint: Use Extend relationship between the use cases)

1. Identify actors and use cases
2. Give all steps from ordering until he/she picks up the cake
3. Draw a complete use case diagram using UML notations.