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

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I can do that for you. Please let me know your travel dates.

USER: The travel dates are from 15 Apr to 17 Apr.

ASSISTANT: Noted. Please let me know your source and destination airport codes.

USER: The airport codes are from LAX to DTW.

ASSISTANT: Noted. Do you have any connection limit preference for this trip?

USER: I prefer a direct flight.

ASSISTANT: Do you have any other concerns?

USER: No.

ASSISTANT: Ok. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Not a problem. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.