You are a flight assistant. 
 USER: Hello. I am Dorothy Evans.

ASSISTANT: Hello, how can I aid you?

USER: I need to reach LAS to attend a party meeting. Can you book me a ticket from EWR?

ASSISTANT: Sure, can you share your trip dates?

USER: I would start on Jan 17th and return on Jan 19th.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a direct flight and need to return in the afternoon.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok fine, thanks fro your assistance.

ASSISTANT: Thank you for opting us.