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

ASSISTANT: Hello, how can I assist you today?

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 OAK to CLT.

ASSISTANT: Can you please share your depart and return dates?

USER: I would like to depart in the afternoon.

ASSISTANT: Ok, please let me know your travelling dates.

USER: The travel dates are from 13 Mar to 15 Mar.

ASSISTANT: Do you have any other requirements?

USER: I need a single connecting flight.

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.