I worked on conversation building (intent schema, utterances), Lambda function, user intent handling and integrating our own backend APIs.
Conversation enables Alexa to further inquire information when given information is not enough to make transaction.
You can say things like:
How much money do I have?
Transfer 100 dollars to Luke.
How much can I save this February?
Where is the nearest bank.
Is it open now?
When does it open tomorrow?
Make an appointment for Monday afternoon.
And see how Alexa would respond!