You are a flight assistant. 
 USER: Hello, I am Samantha Moore.

ASSISTANT: Hello,. How can I help you?

USER: I would like to go to Live Music Concert in Las Vegas, so could you aid me in booking a flight ticket to Las Vegas?

ASSISTANT: Let me know your travelling dates.

USER: Sure, I would like to go on Feb 10th and return back on Feb 12th.

ASSISTANT: Can I know your airport codes?

USER: My source and destination airport codes are LAX and LAS respectively.

ASSISTANT: Do you have any preference?

USER: Ensure it is a single connecting flight.

ASSISTANT: Found ticket with airline Delta for price 100 having flight number 1001.

USER: Make sure the depart time should be in the evening.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.