You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Dennis Campbell.I am planning to travel from LAX to ATL for a business meeting. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, can I know your travel dates?

USER: Sure, the departure date is on 01/01 and the return date is on 01/03.

ASSISTANT: Sorry Dennis, I didn't find any flight with your details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: You are welcome.