You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please help me to book a flight ticket from IAD to AUS.

ASSISTANT: Sure, may I know your travel dates?

USER: My journey dates are from Apr, 01 to Apr, 03.

ASSISTANT: Do you have any specifications?

USER: I need  a direct flight to fly.

ASSISTANT: May I know your name?

USER: James Gonzalez.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Thank you.

ASSISTANT: Thank you.