You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I have a business meeting in Las Vegas. Can you help me for booking a flight ticket from HOU to AUS?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are June 10 and June 12.

ASSISTANT: Can I know your name please?

USER: My name is Sandra Parker.

ASSISTANT: Do you need any specifications?

USER: My depart time is afternoon.

ASSISTANT: Can I know your preferences?

USER: I prefer to book a economy class.

ASSISTANT: Sorry, there are no flights found.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.