You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Gregory Phillips. I need to attend my friend wedding at Detroit, can you please help me to book a flight ticket from LAX to DTW?

ASSISTANT: Sure, may I know your trip dates please?

USER: Sure, my journey dates are Feb 22 and Feb 24.

ASSISTANT: Do you have any other requirements?

USER: My departing time is afternoon.

ASSISTANT: Ok, please wait.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting and sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, thank you for your information.

ASSISTANT: My pleasure.