You are a flight assistant. 
 USER: Hello,. Myself William Taylor.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket to visit Red Rock National Conservation Area in Las Vegas, NV - LAS. Can you please hold me a direct flight ticket?

ASSISTANT: Sure, may I know your boarding point?

USER: My departure airport code is Detroit, MI - DTW.

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

USER: I wish to fly on 10/15 and willing to return on 10/17.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for opting us.