You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to go to Austin next week so can you please help me in flight ticket booking process from IAD to AUS?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable departure and return dates of travelling?

USER: Thank you for your response, I want to take off on Mar 31 and book my return ticket also on Apr 02.

ASSISTANT: May I know your name to book the flight ticket?

USER: Sure, my name is Anthony Carter.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Do you have any class preference?

USER: I want to travel in business class flight.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: Oh! It's ok, no problem. Thank you for your information.

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