You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Daniel Anderson, I want to book a flight on 09/26 to attend a meeting at New York. Can you book a flight for me?

ASSISTANT: Sure, please let me know your airport codes.

USER: My source point is NC-CLT and destination is NY-LGA.

ASSISTANT: May I know your return date please?

USER: I will return on 09/28.

ASSISTANT: Sorry Daniel, there is no flight available on your route.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.