You are a flight assistant. 
 USER: Hello. I am Ronald Young.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to book a ticket from LAX to LAS, can you please book a ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are on June 27 and June 29.

ASSISTANT: Do you have any airline preferences?

USER: I need a normal cost airlines.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time should be at evening.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, not a problem. Thank you.

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