You are a flight assistant. 
 USER: Hello.

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

USER: Can you help me in booking a flight ticket from BOS to LAX?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on Mar 06th and return back on Mar 08th.

ASSISTANT: Noted. Do you have any preferences?

USER: Ensure it is a direct flight.

ASSISTANT: Do you have any time preference?

USER: Make sure the return time is in the morning.

ASSISTANT: May I know your name please?

USER: Myself Rebecca Walker.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: That's ok, thank you for checking the availability.

ASSISTANT: You are welcome, have a nice day.