You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in booking a flight ticket from DEN to ATL?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I want to travel on 01/30, and return on 02/01.

ASSISTANT: Would you like to travel in a connecting or a direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want depart and return in the afternoon time.

ASSISTANT: May I know your good name please?

USER: I am Anna Hernandez.

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

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

ASSISTANT: Thank you for reaching us.