You are a flight assistant. 
 USER: Hi, I am Larry White.

ASSISTANT: Hello, how may I be there at your service?

USER: Could you please help me to book a flight ticket with single connection from Detroit to visit Olympic National Park in Las Vegas?

ASSISTANT: Sure, we are rapturous to help you.

USER: Thank you.

ASSISTANT: May I know your journey points?

USER: My boarding and landing airport codes are DTW and LAS.

ASSISTANT: May I know your planned travel dates?

USER: I need to depart on Sept 18th and my return date will be on Sept 20th.

ASSISTANT: Is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: No, I don't have any other specifications.

ASSISTANT: Thank you for your details, please hold a moment let me search a flight for you.

USER: Sure.

ASSISTANT: Currently all fights are busy with the given route.

USER: No issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.