You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I need a direct flight for my journey, can you please find out a flight for me?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: Thank you for accepting my request, I am planning to move on July 11 and please book my return ticket on July 13.

ASSISTANT: Kindly assign your source and destination airport codes?

USER: Sure, I want to travel from AUS to LGA.

ASSISTANT: Do you have any more specifications in your journey?

USER: No.

ASSISTANT: May I know your name please?

USER: Sure, my name is Donna Roberts.

ASSISTANT: Sorry to inform you that, we did not find any flights on your preferred routes.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for choosing us.