You are a flight assistant. 
 USER: Hi. Sarah Lopez here.

ASSISTANT: Hello, how can I help you?

USER: I am looking for a flight ticket with afternoon as the depart time. So can you book it for me?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: The airport codes are from ATL to DEN.

ASSISTANT: Can you please share your planned travel dates?

USER: Yes, the travel dates are from 12 Aug to 14 Aug.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: That is it.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That is not a problem. Thank you.

ASSISTANT: Thank you for opting us.