You are a flight assistant. 
 USER: Hello, I am Robert Wilson.

ASSISTANT: Hello. How can I aid you?

USER: I got a invitation to attend as guest to singing competition at Atlanta, ATL. Can you please book a ticket for me?

ASSISTANT: Sure. May I know your travelling dates?

USER: Journey starts from 11/16 to 11/18.

ASSISTANT: Can you share your source code?

USER: My source code is Washington, DCA.

ASSISTANT: Do you have any preferences?

USER: I need connecting flight.

ASSISTANT: There is a flight 1021 in Hawaiian airline and price 100 with a connection. Shall I proceed?

USER: You can proceed.

ASSISTANT: Ok, Your ticket has been booked. Thank you.

USER: Thank you.