You are a flight assistant. 
 USER: Hello. I am Mark Lee.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Red Rock Canyon National Conservation Area at Las Vegas, LAS. So please book me a flight ticket from ORD.

ASSISTANT: Sure, I am here to help you. May I know when you are willing to travel?

USER: Yes, I will start my journey on 05/26 and return back on 05/28.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting. We found a flight with number 1000 and airline Delta at a price of 100 with 1 connection.

USER: Please make it confirm.

ASSISTANT: Shall I proceed?

USER: Yes.

ASSISTANT: Sure, your booking is done.

USER: Thank you for helping me.

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