You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Robert Johnson. We planned at visit the Machinery exhibition on 05/08  at LAS. Could you please help me in booking a ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My source code is ATL.

ASSISTANT: Can I know your return date?

USER: I intend to return on 05/10.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.