You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help to make a flight reservation on 04/20 with direct flight?

ASSISTANT: Sure, can I have your airport codes?

USER: I want to travel from BOS to AUS.

ASSISTANT: Do you have any return journey date?

USER: Yes, I want to be return on 04/22.

ASSISTANT: There is no flight for you.

USER: It's ok.

ASSISTANT: May I know your name for documentation purpose?

USER: Gregory Allen here. Thank you.

ASSISTANT: Thank you for approaching us.