You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Gregory Hernandez, want to travel from DFW to ATL. Please help me in booking my ticket.

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

USER: My planned travelling dates are from 09/05 to 09/07.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a direct flight.

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

USER: My departing time will be in the evening.

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

USER: It's ok, thank you for your help.

ASSISTANT: You are welcome.