You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book a flight from Dallas, DFW?

ASSISTANT: Sure, please let me know your travel dates.

USER: I would like to go on 08/16-08/18.

ASSISTANT: Can I have your destination please?

USER: Los Angeles , LAX is my landing point to attend my business meeting.

ASSISTANT: May I know your name please?

USER: I am Dorothy Green.

ASSISTANT: There are no flights with your requirement.

USER: Ok, thanks for sharing the information.

ASSISTANT: Have a good day.