You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to book a ticket from Austin, AUS to go for long trips. Can you please book a ticket to Houston, HOU?

ASSISTANT: Sure, may I know your journey dates please?

USER: My journey dates are Apr 6 and Apr 8.

ASSISTANT: At which time you would like to start and end your journey?

USER: My depart time is evening.

ASSISTANT: Do you have any other requirements?

USER: Yes, I prefer economy class.

ASSISTANT: There is a flight available with an American airlines of flight 1016 in an economy class with depart time 20:00 PM. Can I proceed with the booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.