You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Barbara Carter. Can you help me in booking on 04/21 to 04/23?

ASSISTANT: Sure, can you please share your source and destination airport codes?

USER: I will fly from DEN to ATL.

ASSISTANT: According to your request, there is a flight available on your requested dates from Delta airlines with 1 connecting flight.

USER: You can book it.

ASSISTANT: Shall I confirm your ticket?

USER: I need a direct flight.

ASSISTANT: Your ticket is booked with flight 1014. Sorry, no direct flight is available on your requested dates.

USER: No issue, thank you.

ASSISTANT: You are welcome.