You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to attend my friend marriage at AUS, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Helen Nelson.

ASSISTANT: Can you provide your travel dates?

USER: My travelling dates are Jan 01 and Jan 03.

ASSISTANT: Do you need a stopover?

USER: I need a connecting flight.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Do you have any airline preferences?

USER: My airline preference is normal-cost.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please wait a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no flight service available on your required route.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.