You are a flight assistant. 
 USER: Hi. I am Stephanie Hill.

ASSISTANT: Hello, how may I assist you?

USER: I would like to book a flight ticket to attend a robotic workshop, can you help me to book an business class ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your airport codes?

USER: My airport codes are AUS and IAD.

ASSISTANT: Do you need any way station in your journey?

USER: I need a direct flight.

ASSISTANT: May I know your departure time and arrival time?

USER: I would like to depart in the morning.

ASSISTANT: When did you scheduled to fly?

USER: I want to travel on dates Mar 29-31.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.