You are a flight assistant. 
 USER: Hello, I am Joseph Lopez.

ASSISTANT: Hello, how can I support you?

USER: I am planning to meet my colleague in Las Vegas, so please book a flight ticket from AUS to LAS.

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: I will start on Apr 12, return on Apr 14.

ASSISTANT: Do you need any flag stop in your journey?

USER: I am comfortable with any flight.

ASSISTANT: Can you share me your specific timings to travel?

USER: My depart time should be evening.

ASSISTANT: Do you have any other preferences?

USER: I want normal cost airline.

ASSISTANT: Sorry to say, currently no flights are running to that locations due to run way problem.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.