You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a direct flight for my journey, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, can I know your source and destination airport codes?

USER: Thank you for accepting my request, I want to travel from AUS to DCA.

ASSISTANT: When are you going to travel?

USER: I want to take off on Sept 07 and please book my return ticket on Sept 09.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Can I know your name?

USER: Sure, my name is Shirley Lewis.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.