You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jennifer Lopez here.

ASSISTANT: How can I assist you today?

USER: Can you book a flight ticket for my travel dates that is from 20 Aug to 22 Aug?

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

USER: The airport codes are from CLT to DFW. The depart time would be afternoon.

ASSISTANT: May I know your class preference please?

USER: That does not matter.

ASSISTANT: Ok, please wait for a while.

USER: The return time would also be afternoon. I need a single connecting flight.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights available for you on those dates with your given details.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.