You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Pamela Mitchell. Can you help me in booking a flight ticket from ATL to LAS?

ASSISTANT: Sure, can you share your trip dates?

USER: I want to travel on 12/29, and return on 12/31.

ASSISTANT: Do you have any preferences?

USER: I want to return in the afternoon time.

ASSISTANT: Do you have any other specifications?

USER: No.

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

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.