You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Myself Raymond Williams. Can you please help me in booking a flight ticket from ATL to LAS locations?

ASSISTANT: Sure, can you please tell us your planned journey dates?

USER: My travelling dates are from 12/15 and 12/17.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: It's ok. Thank you for the information.

ASSISTANT: You are welcome.