You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Jacob Moore.

ASSISTANT: Jacob Moore, how may I help you?

USER: I want to book a flight ticket from DEN to ATL. Can you help me in that?

ASSISTANT: Sure, please share your trip dates.

USER: My trip dates are Nov 19 to Nov 21.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: At what time do you want to schedule your journey?

USER: My return time should be in the afternoon.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.